color td1a_64

Page 1 of 1 INDUSTRIAL OILS AND DERIVATIVES AOCS Official Method Td 1a-64 Revised 2000 Color Gardner 1963 (Glass Standards) DEFINITION This method determines the color by comparison with standards of specified color. SCOPE Applicable to natural and synthetic drying oils, fatty acids and oil derivatives that do not differ in hue appreciably from the standards. APPARATUS 1. Glass standards—eighteen, numbered separately, hav- ing the transmittance characteristics given in Table 1 and the tolerance specified in Notes, 2. Details of sup- pliers of glass standards may be obtained from The Tintometer Limited, Waterloo Road, Salisbury, Wiltshire, SPI 2JY, UK. Tel: +44 1722 327242, Fax: +44 1722 412322, E-mail: [email protected] 2. Clear glass tubes—10.65 ± 0.025 mm i.d. and about 114 mm outside length. (Viscosity tubes, as described in AOCS Official Method Tq 1a-64, are satisfactory. Kimble EXAX test tubes, #46463-1075, may also be used.) 3. Suitable apparatus for comparing sample and standards— The apparatus may be of any design, but, for the highest precision, should have the following characteristics: (a) Illumination—CIE Illuminant C. (b) Surrounding field—Should not differ significantly in brightness from the sample and standards, and should be essentially achromatic. (c) Field of view—Two standards and the sample should subtend a visual angle of about 2°. Two standards and a sample should always be in the field of view. (d) Separation of standard and sample—There should be a perceptible separation between sample and standard, but this should be as small as mechani- cally possible. Other conditions may be used, if they can be demon- strated to give the same results. PROCEDURE 1. All hazy material should be filtered at 25°C. 2. Fill a sample tube (Apparatus, 2). 3. Compare with standards, bringing the next lightest and next darkest into the field of view at the same time. REPORTING 1. The color of the sample is reported as the number of the standard most closely matching the sample. If the sample falls between two standards, it will be reported as “+” or “-” depending on whether it is darker (+) or lighter ( -) than the standard it most closely approach- es. Thus, between colors 5 and 6, the steps will be 5, 5+, 6-, and 6. COLOR STANDARDS 1. The standard shall be of glass, with the color produced by the glass component only, and shall have the color characteristics given in Table 1. NOTES 1. The values of the chromaticity coordinates may be obtained by spectrophotometric measurements, in accordance with ASTM standards. 2. Tolerance—individual standards shall not depart from the coordinates given in Table 1 by more than 1 ∕3 of the distance to the next color. In any one set, no two standards shall be closer together than 2 ∕3 of the nominal value of the color difference between them. Table 1 Chromaticity coordinates of reference standards. Chromaticity coordinates a Standard number X Y 1 .3177 .3303 2 .3233 .3352 3 .3329 .3452 4 .3437 .3644 5 .3558 .3840 6 .3767 .4061 7 .4044 .4352 8 .4207 .4498 9 .4343 .4640 10 .4503 .4760 11 .4842 .4818 12 .5077 .4638 13 .5392 .4458 14 .5646 .4270 15 .5857 .4089 16 .6047 .3921 17 .6290 .3701 18 .6477 .3521 a See Notes, 1.

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Page 1 of 1

INDUSTRIAL OILS AND DERIVATIVES

AOCS Official Method Td 1a-64Revised 2000

ColorGardner 1963 (Glass Standards)

DEFINITIONThis method determines the color by comparison with standards of specified color.SCOPEApplicable to natural and synthetic drying oils, fatty acids and oil derivatives that do not differ in hueappreciably from the standards.

APPARATUS1. Glass standards—eighteen, numbered separately, hav-

ing the transmittance characteristics given in Table 1and the tolerance specified in Notes, 2. Details of sup-pliers of glass standards may be obtained from TheTintometer Limited, Waterloo Road, Salisbury,Wiltshire, SPI 2JY, UK. Te l : +44 1722 327242, Fax:+44 1722 412322, E-mail: [email protected]

2. Clear glass tubes—10.65 ± 0.025 mm i.d. and about114 mm outside length. (Viscosity tubes, as describedin AOCS Official Method Tq 1a-64, are satisfactory.Kimble EXAX test tubes, #46463-1075, may also beused.)

3. Suitable apparatus for comparing sample and standards—The apparatus may be of any design, but, for the highestprecision, should have the following characteristics:(a) Illumination—CIE Illuminant C.

(b) Surrounding field—Should not differ significantlyin brightness from the sample and standards, andshould be essentially achromatic.

(c) Field of view—Two standards and the sampleshould subtend a visual angle of about 2°. Tw ostandards and a sample should always be in thefield of view.

(d) Separation of standard and sample—There shouldbe a perceptible separation between sample andstandard, but this should be as small as mechani-cally possible.

Other conditions may be used, if they can be demon-strated to give the same results.

PROCEDURE1. All hazy material should be filtered at 25°C.2. Fill a sample tube (Apparatus, 2).3. Compare with standards, bringing the next lightest and

next darkest into the field of view at the same time.

REPORTING1. The color of the sample is reported as the number of

the standard most closely matching the sample. If thesample falls between two standards, it will be reportedas “+” or “−” depending on whether it is darker (+) orlighter (−) than the standard it most closely approach-es. Thus, between colors 5 and 6, the steps will be 5,5+, 6−, and 6.

COLOR STANDARDS1. The standard shall be of glass, with the color produced

by the glass component only, and shall have the colorcharacteristics given in Table 1.

NOTES1. The values of the chromaticity coordinates may be

obtained by spectrophotometric measurements, inaccordance with ASTM standards.

2. Tolerance—individual standards shall not depart fromthe coordinates given in Table 1 by more than 1⁄3 of thedistance to the next color. In any one set, no two stan-dards shall be closer together than 2⁄3 of the nominalvalue of the color difference between them.

Table 1Chromaticity coordinates of reference standards.

Chromaticity coordinatesa

Standard number X Y

1 .3177 .33032 .3233 .33523 .3329 .34524 .3437 .36445 .3558 .38406 .3767 .40617 .4044 .43528 .4207 .44989 .4343 .4640

10 .4503 .476011 .4842 .481812 .5077 .463813 .5392 .445814 .5646 .427015 .5857 .408916 .6047 .392117 .6290 .370118 .6477 .3521

aSee Notes, 1.

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