Standard Test Method for
Comparing Colors of Films from Water-Emulsion Floor
Polishes1

This standard is issued under the fixed designation D 3210; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval

1. Scope

1.1 This test method covers comparing colors of films (or
solids) deposited from the emulsified particles in water emulsion floor polishes. It is based upon luminous reflectance
measurements made with tristimulus colorimeters such as the
Hunter Color Difference Meter.2

1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.

1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

2.1 ASTM Standards:
E 259 Practice for Preparation of Reference White Reflectance Standards3

3. Terminology

3.1 Definition:

3.1.1 whiteness index—a color measurement calculated
from the equation4
WI 5 L 2 3b (1)
where L and b are values measured directly with the Color
Difference Meter. L measures lightness, which is 100 for
perfectly white and zero for black; and b measures yellowness
when plus, blueness when minus, and zero for neutral gray or
white. Conversion factors for instruments reading in X, Y, Z

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