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ASTM C609-90(1995)

Historical Reaffirmation

Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile

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1.1 This test method covers the measurement of a visually small color difference between two pieces of solid-colored, glazed or unglazed ceramic tile, using any photoelectric instrument that meets the requirements specified in the test method. The amount and the direction of the color difference are expressed numerically, with sufficient accuracy for use in product specification.

1.2 This test method should not be used for determining small color differences between tile that have a multicolored, speckled, or textured surface, because the results may not be valid.

1.3 Color difference between specimens found to be metamers (see 3.2), by visual examination, can be accurately evaluated by spectrophotometric measurement only. Therefore, visual color comparison of test specimen and reference specimen should be made under incandescent light and under daylight fluorescent light before any instrumental measurement. If visual color difference under the two light sources is not of the same magnitude, the pair of tile must be considered metamers.

1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 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.


SDO ASTM: ASTM International
Document Number C609
Publication Date Jan. 1, 2000
Language en - English
Page Count 4
Revision Level 90(1995)
Supercedes
Committee C21.06
Publish Date Document Id Type View
Oct. 1, 2023 C0609-23 Revision
April 1, 2020 C0609-20 Revision
May 1, 2007 C0609-07 Revision
Aug. 1, 2019 C0609-07R19 Reaffirmation
Jan. 1, 2014 C0609-07R14 Reaffirmation
Jan. 1, 2000 C0609-90R00 Reaffirmation
Jan. 1, 2000 C0609-90R95 Reaffirmation