DESIG: D3157 84 (Reapproved 2001) TITLE: Standard Test Method for Rubber from Natural Sources-Color 1.1 This test method represents a method of classifying the color of raw rubber according to a standard color scale. 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.