20-65.005. Calculation

(1) Step 1 – The color number is calculated as follows:

(a) For the HunterLab Model D45 Citrus Colorimeter the color number is equal to 22.510 plus 0.165CR plus 0.111CY.

(b) For the HunterLab Model D45D2 Citrus Colorimeter the color number is read directly from the instrument and recorded.

(c) For the Macbeth Color-Eye Spectrophotometer Model LS-1500, the color number is equal to 17 multiplied by the sum of 3.4 times X divided by Y minus Z divided by Y plus 5 divided by Y, and subtract a constant factor 12.6 from the resulting total.

CN = 17(3.4X/Y – Z/Y + 5/Y) – 12.6.

(d) For the Macbeth Color-Eye Spectrophotometer Model 2020+ with Optiview Software Package, the color number is read directly from the instrument and recorded.

(e) For the Macbeth Color-Eye Spectrophotometer Model 3000 and 3100 with Optiview Software Package, the color number is read directly from the instrument and recorded; or it may be calculated from the measured tristimulus X, Y and Z values by applying the equation CN = 14.5(3.15X/Y – Z/Y + 5.2/Y) – 2.6.

(f) For the GretagMacbeth Color-Eye Spectrophotometer Model i5 with Color iQC Basic Software, the color number is read directly from the instrument and recorded; or it may be calculated from the measured tristimulus X, Y and Z values by applying the equation CN = 14.5(3.15X/Y - Z/Y + 4.1/Y) -2.6.

(2) Step 2 – Apply the color number to the following table to determine the color score or equivalent color score for each appropriate product:

	Color	Color Score	Adjustment	Color
	Score for	for FCOJ &	for COJ &	Score for
Color Number	POJ & OJFC	CCOJ	COJFM	COJ & COJFM
32.5 – 33.4	33	33	+2	35
33.5 – 34.4	34	34	+2	36
34.5 – 35.4	—	35	+1	36
34.5 – 34.9	35	—	—	—
35.0 – 36.4	36	—	—	—
35.5 – 36.4	—	36	+1	37
36.5 – 37.4	37	37	+1	38
37.5 – 38.4	38	38	0	38
38.5 – 39.4	39	39	0	39
39.5 – 40.4	40	40	0	40

Rulemaking Authority 601.10(7), 601.11, 601.24 FS. Law Implemented 601.10(7), 601.11, 601.24 FS. History–Formerly 105-1.19(1)(r), (2)(c), Amended 1-1-75, 4-15-76, Formerly 20-65.05, Amended 1-30-86, 1-12-92, 6-21-93, 1-17-95, 10-26-97, 8-22-06.