AATCC 110-2015 Whiteness of Textiles.
3. Terminology
3.1 CIE chromaticity coordinates, n.— the ratio of each of the tristimulus values of a psychophysical color to the sum of the tristimulus values (see 12.1) [ASTM E284].
3.2 CIE tristimulus values, n.— amounts of three non-real reference color stimuli required to give a color match with the color stimulus considered, and defined by the CIE for the CIE 1931 standard colorimetric observer and the CIE 1964 standard colorimetric observer and for a particular illumination condition (see 12.1).
3.3 fluorescent whitening agent (FWA), n.—colorant that absorbs near ultraviolet (UV) radiation and re-emits visible longer wavelength radiation. This enhances the whiteness appearance of yellowish materials to which it has been applied. [ASTM E284].
3.4 perfect reflecting diffuser, n.— ideal reflecting surface that neither absorbs nor transmits light, but reflects dif- fusely, with the radiance of the reflecting surface being the same for all reflecting angles, regardless of the angular distribution of the incident light. [ASTM E284]. NOTE: The perfect reflecting diffuser is the basis of calibration of reflectance measuring instruments. The equations for whiteness and tint are formulated so that the CIE concept of the perfect reflecting diffuser has a whiteness index of 100.0 and a tint value of 0.0. 3.5 tint, n.—in whiteness measurement, the hue of a white material as influenced by the wavelength of peak emis- sion or reflectance. [CIE 15.2]. NOTE: Tint, if other than zero, is an indication of a reddish or greenish hue having shifted away from a bluish hue with dominant wavelength of 466 nm.
3.6 whiteness, n.—whiteness is the at- tribute by which an object color is judged to approach a preferred white. [ASTM E284]. NOTE: Whiteness as measured by this test method is an indication of how white the textile appears to an average viewer.
4. Safety Precautions NOTE: These safety precautions are for information purposes only. The safety precautions are ancillary to the testing procedures and are not intended to be all inclusive. It is the user’s responsibility to use safe and proper techniques in han- dling materials in this test method. Manufacturers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommenda- tions. All OSHA standards and rules must also be consulted and followed.
4.1 Good laboratory practices should be followed. Wear safety glasses in all laboratory areas.
4.2 CAUTION: Protect the eyes from UV light. The safety recommendations provided by the UV light manufacturer should be followed.
4.3 Manufacturer’s safety recommen- dations should be followed when operat- ing laboratory testing equipment.AATCC 110 pdf download.