1.1 This practice provides guidelines for the instrumental transmittance measurement of the color of coated and uncoated transparent glass. See Terminology E284. 1.2 The practice specifically excludes fluorescent and iridescent samples. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 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.