SIZING - METHODS AND ECONOMIC EFFECT

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210 FLORIDA STATE HORTICULTURAL SOCIETY, 1965 and 0.70 percent. On the basis of these findings, it would seem advisable to manufacture grape fruit oils during the months of February, March, and April to obtain oils with the best odor and flavor characteristics. The production of early season oils should be avoided since they appear to have less desirable odor and flavor qualities. Physical and chemical properties, A pro gressive increase in the nootkatone content of the expressed grapefruit oils from 0.065 to 0.810 percent was observed as the fruit became more mature, Table 1. This is greater than a tenfold increase and could probably be used as a measure of fruit maturity. The physical and chemical characteristics of the six oils are presented in Table 2. It can be seen from these data that the values for: specific gravity, refractive index, optical rotation, evaporation residue, acid num ber, %-free acid, %-ester before acetylation, and %-free alcohol remained more or less constant throughout the processing season. There was a tendency for the %-total alcohol and %-ester after acetylation to decrease, but this is due to aging of the oil samples rather than to fruit maturity. The %-aldehyde increased as the fruit ripened, reaching a plateau in February, March, April, and May, but decreased in June. This is contrary to what the authors (2) have found for coldpressed Valencia orange oil. Since both the nootkatone and aldehyde content increase with fruit maturity, and since these are factors which apparently contribute to flavor as evi denced by the organoleptic studies, it would seem that the ideal time to recover oil from the standpoint of good odor and flavor quality would be when both of these factors reach a combined optimum. The seriously lower yield of oil obtained when processing grapefruit of greater maturity requires careful consideration by the processor as to the importance of nootkatone and aldehyde content to the potential buyer of his oil since other unknown variables may exist which also have an influence on flavor. The yield of oil recovered from the fruit diminished from 2.55 lb/ton fruit to 0.50 lb/ton fruit as the first ripened (5). A compromise can possibly be made between yield and good flavor quality in order to make oil production economically feasi ble. Acknowledgments Grateful acknowledgment is made to: Fritzsche Brothers, Inc., New York; International Flavors & Fragrances (U. S.), New York; and Neumann-Buslee & Wolfe, Chicago, for their help and assistance in the organoleptic evalua tion of the oils. The fruit used- in this study was supplied courtesy of Cypress Gardens Citrus Products, Inc., Winter Haven, Florida. For all of their courtesies and contributions, the authors express their appreciation and thanks. REFERENCES 1. Guenther, E. 1948. The essential oils. 1:427. D. Van Nostrand Company, Inc. 2. Kesterson, J. W., and R. Hendrickson. 1953. Essential oils from Florida citrus. Univ. of Fla. Agr. Exp. Sta. Tech. Bui. 521: 1-70. 3.. 1956. A comparison of two commercial methods for the production of citrus oils in Florida. A.mer. Perfumer and Aromatics 67: 2: 35-38. 4 _ 1963. Evaluation of cold-pressed Marsh grapefruit oil. Amer. Perfumer and Cosmetics. 78: 5: 32-35. 5. Kesterson, J. W., et al. In press. Nootkatone con tent of expressed Duncan grapefruit oil as related to fruit maturity. Amer. Perfumer and Cosmetics. 6. MacLeod, W. D., Jr., and N. L. Buigues. 1964. Sesquiterpenes. I. Nootkatone, a new grapefruit flavor con stituent. Jour, of Food Sci. 29: 5: 565-568. 7. State of Florida Citrus Fruit Laws. 1961. Grapefruit maturity standards. Florida Citrus Code Ch. 601: 601-16. CITRUS SIZING - METHODS AND ECONOMIC EFFECT Earl K. Bowman,1 And Gilbert E. Yost,2 Undustrial Engineer, Transportation and Facilities Re search Division, Agricultural Research Service, U. S. De partment of Agriculture, Gainesville, Florida. 2Agricultural Engineer, formerly Transportation and Facilities Research Division, Gainesville, Florida, now Agri cultural Engineering Research Division, Agricultural Re search Service, U. S. Department of Agriculture, Wenatchee, Washington. Citrus fruit is referred to in terms of size most frequently by a specified number of fruit which are packed into a 1-3/5 bushel capacity crate. For example, size 96, 125, 163, 200, etc. for oranges and size 46, 54, 64, 70, etc. for grapefruit. The same kind of designation ap plies to other citrus fruits, such as tangerines, temples and tangelos.

BOWMAN AND YOST: CITRUS SIZING METHODS 211 Belt and roll sizers have long been used in Florida citrus packinghouses to mechanically size fruit. They were mounted on each row of bins from which fruit was manually place-packed. In recent years, where changes involving the sizing equipment have been made in citrus packinghouses, mostly "central" or "master" sizers still employing the belt and roll principle have been installed. In a few cases, perforated belt sizers have been installed, mainly for tan gerines, and drop-roll or expanding roll type sizing equipment, mainly for oranges and grape fruit. In the day-to-day activity of a fresh citrus packinghouse, the actual dimensions of fruit packed may be treated somewhat casually since the official requirements specify number of fruit per container. There is need for management to keep alert relative to means of sizing and to dimensions of fruit packed as compared to stand ards, however, in order to make decisions about equipment and obtain maximum returns from the fruit input. Since there is overlap in the diam eter dimension ranges for different sizes of fruit, such as oranges or grapefruit, adjustments in sizing can be made which affect either favorably or unfavorably the number of boxes packed on the count basis from a given fruit input. Changes in packing methods or plant layout, for example, may influence the design features of sizing equipment. There are a number of ways in which sizing of fruit and other produce can be accomplished mechanically. Some that are commonly known are referred to in equipment terminology as chain (mesh belt), perforated belt, belt and roll, expanding roll, and weight. All of the mechan ical arrangements mentioned except the weighttype do what is termed dimension sizing. That is, the equipment measures the physical size of the product by either two-point sizing or fourpoint sizing. The chain type represents a means of four-point sizing while the belt and roll type represents a means of two-point sizing. Citrus fruits fall into two geometric shape categories - oblate and prolate spheroids. Grape fruit which are usually "squeezed in" on the stem blossom axis making this dimension less than the diameter are classed as oblate spheroids. Lemons or limes, for example, which normally have a polar dimension (the stem blossom axis) greater than their diameter are classed as prolate spheroids. It is necessary that the make-up of mechanical sizing equipment take this into account. Citrus sizing was studied in a cooperative re search program of the Florida Citrus Experi ment Station and Agricultural Research Service, United States Department of Agriculture. Pur poses of the research effort were: to obtain data on the performance of central sizing equipment employing the belt and roll principle as compared to belt and roll sizers on bins; to explore the sizing action and adaptability of different types of equipment as applied to citrus; and, to de velop guide lines for improved equipment and practices for sizing citrus. Procedure for the studies in commercial packinghouses was to take samples at random of fruit coming from the sizer. Identical pro cedure was followed for various size groups with fruit in each sample. In some cases the samples were taken from the bins and in others they were taken from the belt conveyors carrying the fruit away from the sizer. This depended primarily upon whether a central sizer was being used or whether there was belt and roll sizing equipment mounted on bins. Each fruit was measured for the polar dimension and for the equitorial diameter. The "sizer setting" was determined, i.e., the distance between the belt and roll for each size group, was measured, or the hole diameter in a perforated belt sizer or distance between rollers at the drop-through point for a drop roll sizer, respectively. The surface speed of the belt and of the rolls was obtained where equipment of that type was used in sizing the fruit which was sampled. In the analysis of data which has been made, a number of points have received attention. The ratio of height (polar dimension) to the equitorial diameter was computed for all sam ples and ranged from.92 to.98 for oranges, from.83 to.88 for grapefruit, and from.75 to.78 for tangerines. The average fruit diameter in samples was compared to the sizer setting for belt and roll sizing equipment in several different packing houses and for one drop-roll sizer installation. A pattern was indicated in the fruit diameter sizer setting relationship for belt and roll equip ment in which the sizer setting was found to be slightly greater than the average fruit diameter for oranges while for grapefruit the opposite relationship, sizer setting slightly less than the average fruit diameter, was found (figs. 1 and

212 FLOttfDA STATE HORTICULTURAL SOCIETY, 1965 COMPARISON OF SIZER SETTING AND AVERAGE DIAMETER OF SIZED FRUIT IN SAMPLE ~ ORANGES - 3.40 3130 I-SIZER SETTING (BELT AND ROLL SIZER) B* AVERAGE FRUIT DIAMETER (BELT AND ROLL SIZER) SIZER SETTING (DROP ROLL SIZER) g-average FRUIT DIAMETER (DROP ROLL SIZER) to UJ z 3.20 J..0 2 5 ZOO 1 8.80 5 2T0 CO 2.60 PACKIN6 HOUSE - T 2 3 I 3 5 5 6 7 2 3 13 5 5 6 7 2 3 13 5 5 6 3 3 5 5 6 FRurr size- 252 216 175 150 Figure 1 2). The average difference was 0.11 inches for 25 samples of oranges and minus 0.05 inches for 21 samples of grapefruit. This pattern must be recognized by personnel who set belt and roll sizers and who made adjustments to them, in order to obtain the desired sizing results. On the drop-roll sizer with smooth, straight rolls, the fruit diameter-sizer setting relation ship for oranges was essentially the same as already given on the belt and roll sizers. For grapefruit, the difference was in the same direc tion as for belt and roll sizers, but conspicuously greater (figs. 1 and 2). The amount of differ ence indicates a deficiency, virtually complete lack of needed orientation action, with respect to sizing grapefruit or other citrus fruit in the oblate spheroid classification. The distribution of diameters in each size category for each study was examined. Fre quency charts were plotted (fig. 3) and standard deviation computations were made. The range, which is the difference between the minimum and the maximum diameters in a sample of sized fruit, and the average diameter, both are determined by the distribution. In turn, these affect the proportion of sized fruit which is within the desired dimension range (fig. 3). The standard deviation gives a measure of variability of any group of diameter measure ments. Thus, standard deviation values provide a means for comparing variability between differ ent sizing treatments such as equipment types, speeds and settings. Also, the standard deviation for a group of sized fruit diameter measurements is an indicator of the minimum and maximum dimensions between which, when the same sizing treatment is given, a specific proportion of the diameter dimensions may be expected to fall.

BOWMAN AND YOST: CITRUS SIZING METHODS 213 4.60 COMPARISON OF SIZER SETTING AND AVERAGE DIAMETER OF SIZED FRUIT IN SAMPLE ~ GRAPEFRUIT - 450 4.40 4.30 420 -SIZER SETTING (BELT AND ROLL SIZER)!-AVERAGE FRUIT DIAMETER (BELT AND ROLL SIZER) S-SIZER SETTING (DROP ROLL SIZER) g-average FRUIT DIAMETER (DROP ROLL SIZER) "2 4.10 400 390 3.80 370 360 3.50 340 PACKING HOUSE- 1 2 3 4 5 6 FRUIT SIZE- 96 2 3 4 5 6 60 3 4 5 70 2 3 4 5 6 64 2 6 54 Figure 2 For example, this proportion would be 95 per cent if the minimum and maximum diameters are taken as minus two standard deviations and plus two standard deviations, respectively, from the average fruit diameter for the group (fig. 3). The variability in sized fruit diameter was not substantially different for fruit from either central or bin-row sizers employing the belt and roll principle. Standard deviation values of the diameters in samples of sized tangerines were used to com pute the coefficient of variation for each sample which indicated more uniformity of sizing with the perforated belt sizer than with the belt and roll type (Table 1). One study of sizing grapefruit on an expanding-roll sizer with rings on the rolls gave data indicating better orientation of fruit than was the case for the drop-roll sizer with smooth, straight rolls already mentioned. The coefficient of variation, when computed for each sample, indicated uniformity of sizing approaching that generally shown for grapefruit sized on belt and roll sizers. Variation coefficient values for samples of grapefruit of sizes 70, 80 and 96 ranged from 2.75 to 3.96 for the expanding roll sizer and 2.14 to 3.21 for belt and roll sizers. In addition to the factors mentioned, sizing performance may be affected by: turgidity of fruit, seasonal variations in fruit, surface con dition of fruit and surface condition of the belt and rolls. Further research would be necessary to provide data. When a given type of sizing equipment pre vails, standard deviation values can very appro priately be considered when establishing or revising standard size ranges. The results from research data on orange sizing with belt and roll

214 FLORIDA STATE HORTICULTURAL SOCIETY, 1965 FREQUENCY DISTRIBUTION CHARTS FOR SAMPLES OF SIZE 80 GRAPEFRUIT AT TWO DIFFERENT PACKU46 HOUSES; \00 FRUIT IN EACH SAMPLE. CO X LLIMI" LIMITS. TWO STANDARD DEVIATIONS FROM AVERAGE -381 PERCENTAGE OF OVER AND UNDERSIZED FRUIT OVER- 30 */. UNDER- NONE.33' DIAMETER 1 4.33 I UjU. - 3TO 3fl0 3*5 3190 335 400 405 4.10 415 420 425 430 MINIMUM GRADE DIAMETER- *,. \ ^-MAXIMUM GRADE DIAMETLR AVERAGE DIAMETER (4.07") 85 LIMITS, TWO STANDARD DEVIATIONS FROM AVERAGE DIAMETER (5 2S I K 20-4-.06"-*- PERCENTA6E OF OVER AND UNDERSIZED FRUIT OVER NONE UNDER - 7.0 I «S 10 FRUlT DIAMETER ' ' ' M INCHES - 3.70 ST5 3.80 585 MINIMUM GRADE DIAMETER *. AVERAGE DIAMETER (3.87") i I I I I I I I 1 I 390 395 400 405 410 415 420 425 430 1 ^MAXIMUM GRADE DIAMETER Figure 3

BOWMAN AND YOST: CITRUS SIZING METHODS 215 TABLE 1.-- Diameter and coefficient of variation for samples of tangerines from specified sizing equipment Sizing Fruit in Aver age Diameter ranee Coefficient Fruit size equipment sample diameter Min. Max. of variation Count per box Type!/ Number Inches Inches Inches 210 P.B. 2.41 2.30 2.01 B.R. 2.45 2.30 2.70 3.49 2.40 2.48 2.45 2.25 2.30 2.00 2.60 3.00 2.85 3.11 5.61 6.08 176 P.B. 2.35 2.19 2.57 2.45 1.60 B.R. 2.58 2.35 2.85 3.64 2.25 2.75 3.50 2.51 2.54 2.47 2.35 2.35 2.30 2.75 3.00 2.80 3.36 4.21 3.66 150 P.B. 2.64 2.80 2.34 B.R. 2.78 2.63 2.72 2.55 2.45 3.00 2.80 2.95 3.71 2.64 3.53 2.72 2.55 2.95 3.45 2.90 3.18 120 P.B. 2.84 3.15 3.01 B.R. 2.79 2.89 2.70 2.95 3.05 2.44 3.22 2.95 2.60 3.15 3.76 2.83 3.00 2.58 \l P.B. indicates perforated belt type sizer B.R. indicates belt and roll type sizer equipment in commercial packinghouses illus trate this. Only the smallest standard deviation of diameters for any sample of oranges (one out of 25 samples) gave a range of 0.25 inch in which 95 percent of the fruit diameters could be expected to fall. Therefore, standard size ranges of 0.25 inch (for oranges 150 size and smaller, "uniform in size") may be expected to be difficult to meet in practice. Wider ranges were provided when standard dimension ranges for oranges were revised in 1958. For grapefruit, only two out of 21 samples of size 64 and smaller grapefruit from belt and roll sizers gave a standard deviation small enough that 95 percent of the fruit could be expected to fall within a range of 6/16 inches which is the standard range for grapefruit "uniform in size" of 64 size and smaller. A small capacity belt and roll sizer, a part of the equipment in the Campus Packinghouse of the Fruit Crops Department, University of Florida, was modified to provide variable speed drive for the belt and rolls for research purposes. With this equipment, tests were run to investi gate the effect on sizing performance of different belt and roll speeds. Belt speeds of 350, 300 and 250 feet per minute were used. With each belt speed, roll surface speeds of 280, 140 and 0

216 FLORIDA STATE HORTICULTURAL SOCIETY, 1965 TABLE 2.--Increase per day in 1-3/5 bushel boxes of oranges and gross income from sales by specified change in sizing practice at given packed fruit output rates. Packed fruit per day Percent ; of fruit in each size shifted to larger size A/ next 5 10 15 Car loads 1/ Boxes Dollars 3/ Boxes Dollars 3/ Boxes Dollars 1/ 4 25 90 50 180 75 270 8 50 180 360 150 540 1/ Using sizes 125, 163, 200 and 252; no fruit shifted into size 252 from smaller size. 2/ A carload represents 500 1-3/5 bushel boxes..3/ Based upon gross f.o.b. Florida per box price for oranges, average for 1954-55 through 1958-59 seasons, Fla. State Marketing Bureau, Annual Agricultural Statistical Summary. feet per minute were used. Fifty fruit each of three different size groups were provided by hand calipering for the desired size ranges. Each fruit was numbered and measurements were recorded relative to the identifying number. The fruit especially calipered for the research activ ity were run through the sizer three times for each belt and roll speed combination. Fruit of all three sizes were randomly mixed together to go into the sizer for each run. The results ex pressed in terms of the percentage of fruit of each size going into the proper bin for that size, into a bin for a smaller size and into a bin for a larger size are given in figures 4 and 5. It is indicated that relatively large differences in roll speed materially affect the sizing perform ance. Changes in sizing performance were small in the range of belt speed which was used. The equipment did not have capability for testing higher belt speeds and drastically reduced belt speed would result in unacceptably low flow rate of fruit through the sizer. Generally, belt and roll sizing equipment in commercial packing houses was found to be operating at speeds with in the range desirable for this type of equipment as indicated by these tests. In addition to the consideration of perform ance as reflected in the diameter measurements of fruit samples, other factors and comparative relationships for different kinds of sizing equip ment are: Belt and roll sizing equipment This type of equipment may be easily and quickly changed to size either oranges, grapefruit or tangerines. Such flexibility is of high impor tance for most citrus packinghouses. Without it, the need for having additional sizing equip ment in a packinghouse because of the different citrus fruits handled must be considered. Also, belt and roll sizers are relatively easy to adjust for changes which may be desired in sizing. This type of sizing equipment performs a credit able job according to the research data. "Cen tral" or "master" sizers employing the belt and roll mechanism adapt to more efficient packing arrangements such as roll-board manual packing or machine packing, and other possibilities for improved space utilization.

BOWMAN AND YOST: CITRUS SIZING METHODS 217 Perforated belt sizing equipment This type of equipment lacks flexibility for changing from one kind of citrus fruit to another or for making any adjustment in the sizing. It is necessary to change belts in order to make any change for kind of fruit or adjustment in the way any fruit is sized. With fruit passing through a full circle opening there is not as much opportunity for variability in sizing as with types of equipment in which contact with the fruit is limited to two points only. Expanding roll sizing equipment This type of equipment is in the category of two-point sizing means, as mentioned earlier, when straight rolls are used. When rings are placed on the rolls, the sizing action is different and possibly should be considered in the fourpoint category. Comments on performance as pects, with each of the two kinds of rolls, are given. Straight rolls Inherently it is not well suited to sizing grapefruit or any fruit in the oblate spheroid classification since there is a serious lack of needed orientation action. It offers the possibility of satisfactory sizing for fruits that are in the spherical or prolate spheroid classifi cation. Also, it permits easy adjustment for changes in sizing and for different size ranges of spherical fruit. Good capacity relative to floor space requirements for the equipment is also a feature. Rolls with rings The basic mechanism is the same as for expanding roll sizing equipment with straight rolls. The use of rings on the rolls provides better orientation and control of the fruit as it is handled by the sizer. It was DISTRIBUTION OF PREMEASURED PARSON BROWN ORANGES AS SIZED BY BELT AND ROLL SIZER AT SPECIFIED SPEEDS - -90-80 -70 IU Q. -60-90- 80- Z LJ O o: 70- UJ Q. 60-50- III I Illllllll C D E F 6 H J AB CDEFGHJ 111 IIII BCDEFGHJ -50 SIZE 252 SIZE 200 SIZE 163 LEGEND I I FRUIT INTO BIN OF LARGER SIZE GROUP(S). FRUIT INTO BIN OF SMALLER SIZE GROUP (S). FRUIT INTO BIN OF PROPER SIZE GROUP. NOTE: PERCENT CHARTED IS AVERAGE OF THREE RUNS. BAR SIZER SPEEDS (FPM) ELELI ROLL BELT ROLL 250 0 BAR F 300 280 250 140 G 350 0 250 280 H 350 140 300 0 J 350 2 80 300 140 Figure 4

218 FLORIDA STATE HORTICULTURAL SOCIETY, 1965 indicated from limited studies on one such ma chine that fruit in the oblate spheroid classifica tion can be sized satisfactorily with this sizer. Thus, it offers possibilities in one machine for satisfactorily sizing both oblate and prolate spheroidal classes of fruit. A practical expres sion of this would be in the possible flexibility to size lemons with the same sizer as used for grapefruit and oranges. Weight sizing equipment This means of sizing is not generally used in citrus packinghouses. Test runs for weight sizing were not included in the research. A number of points appear to be important in con sidering weight sizing as compared to dimension sizing. For example, the additional attention and adjusting involved because of variations in specific gravity of the fruit which is not involved in dimension sizing; possible greater initial cost of the equipment for given output capacity; means for carrying (cups or holders) different kinds of fruit through the machine for satis factory weighing to permit use of the machine for fruit ranging in physical size from grape fruit to tangerines; maintenance requirements to sustain satisfactory performance and weighing accuracy; equipment floor space needs for given output capacity versus floor space for other types of sizing equipment. Sizing practice is important in connection with "packout" of fruit which is obtained. That is, the number of packed containers of saleable fruit obtained from a given input quantity. "Pack out" directly influences the monetary returns to the packinghouse and must be of vital concern for management personnel. (1, 2) Even though the distribution of diameter measurements in given fruit size categories is DISTRIBUTION OF PREMEASURED DUNCAN GRAPEFRUIT AS SIZED BY BELT AND ROLL SIZER AT SPECIFIED SPEEDS -90-80 UJ o -60 S Q. 90-80- 70-60- 50-40- C D E F G SIZE 80 I I FRUIT INTO BIN OF LARGER SIZE GROUP(S). EJ;jl;j=j;H FRUIT INTO BIN OF SMALLER SIZE GROUP(S). fruit into bin of proper size group. C D E F G H SIZE 70 note: percent charted is average of three runs. BAR A B C D E. 1 C D E F G H SIZE 64-30 - o SIZER SPEEDS (FPM) BELT ROLL BELT ROLL 250 0 BAR F 300 280 2 50 140 G 350 0 250 280 H 350 140 300 300 0 J I 40 350 280 Figure 5

HUGGART, WENZEL, BARRON: ORANGE JUICE COLOR 219 acceptable for difference between minimum and maximum, it must align with the standard dimension range in such a way that undersize fruit is within the tolerance provided and over size fruit is not only within the tolerance speci fied, but is held to a minimum in order to obtain the maximum number of filled containers of saleable fruit from the total input. Oversize fruit in a given size range should go in the next larger size insofar as possible without causing poorly filled shipping containers or in some way detracting from favorable acceptance in the market place. Fruit samples taken in commercial packinghouses using belt and roll sizers showed an average of approximately 13 percent oversize and 4 percent undersize for oranges. For grapefruit, the corresponding figuures were approximately 20 percent oversize and 2 percent undersize. Calculations have been made to provide an example (Table 2) of the increase in boxes of fruit and dollars of revenue theoretically possible by sizing so as to shift given percentages of fruit of each size to the next larger size for packing. The possible effect on revenue indicates a need for regularly scrutinizing the sizing prac tice in fresh citrus packinghouses. Acknowledgments Dr. James Soule, Associate Horticulturist, De partment of Fruit Crops, University of Florida, coordinated the part of the research which was conducted in the Fruit Crops Department pack inghouse, with other programs involving use of the packinghouse facilities. He gave valuable counsel concerning test procedures and analysis of the data. His contribution is gratefully acknowledged. Appreciation is expressed to Dr. A. H. Krezdorn, Chairman, Fruit Crops Department, Uni versity of Florida, for making the facilities at the packinghouse available for research. LITERATURE CITED 1. Grierson, W., The effect of pack-out on grower profits. Proc. of Fla. State Hort. Soc. 70: 21-28, 1957. 2. Grierson, W., Causes of low pack-outs in Florida packinghouses. Proc. Fla. State Hort. Soc. 71: 1C6-170, 1958 A NOMOGRAPH RELATING SUBJECTIVE AND OBJECTIVE METHODS FOR MEASURING COLOR OF FLORIDA ORANGE JUICES1 R. L. HUGGART,2 F. W. WENZEL,3 AND R. W. Barron2 Abstract Hunter Color and Color-Difference Meter a values (redness) have been reported to correlate very closely with visual color of reconstituted frozen concentrated orange juices. Since the 1953-54 citrus season, the quantity of extremely fine pulp particles that become suspended in con centrate during processing has increased. This has influenced the Rd value (lightness). With certain methods of sample presentation, Rd and a values are of almost equal importance. A nomo- 1. Cooperative research of the Florida Citrus Commis sion and Florida Citrus Experiment Station. 2Florida Citrus Commission, Lake Alfred. 3Florida Citrus Experiment Station, Lake Alfred. Florida Agricultural Experiment Stations Journal Series No. 2231. Introduction graph relating the a and Rd values to visual scores of orange juices is presented. Color, an important characteristic of citrus juices, depends upon fruit variety, maturity, season, processing methods, and other factors. Accurate, practical and objective means of de termining juice colors could enable processors to standarize within a small selected color range throughout a season and from year to year. The blending of rich orange and pale yellow colored juices within such a range could be controlled very closely. The measurement of color has become a useful tool to the food industry. The basic facts of color, its 3 dimensions, the tools and techniques of measurement, and other facets of this inter esting and complex subject are adequately covered by Judd and Wyszecki (6). Color instru ments that are being used in the food industrytoday, with a discussion of methods of application