Meaning and use

4.1 Whitening color matching is due to the use of different colorants (pigments, dyes, etc.) to achieve the same color matching. Usually, buyers require color matching to be non-standard; This practice allows for rapid testing of the requirement both in the field and in the laboratory. If non-polymer matching is not possible or feasible, certain restrictions on metamerism may be required due to cost or other reasons. The procedure for estimating the degree of metachromatism described in this practice provides a means of assessing the effectiveness of this limitation.

ASTM D4086-2018 Standard Practice for Visual Assessment of Anisotropy

Step 1: Scope

1.1 This practice describes visual methods for detecting isochromatic spectra and estimating the magnitude of chromatic aberrations in isochromatic spectra.

1.2 Practice is limited to the consideration of light source isochroma and observer isochroma. This practice does not include gonioapparent samples.

1.3 This approach does not provide for the calculation of the isochromatic index based on instrumental measurements of spectral characteristics.

1.4 This standard is not intended to address all safety concerns, if any, associated with its use. It is the responsibility of users of this standard to establish appropriate safety, health and environmental practices and to determine the applicability of regulatory restrictions prior to use.

1.5 The international standard is based on internationally recognized standardization principles established in the “Decision on Principles for the Development of International Standards, Guidelines and Recommendations” issued by the Committee on Technical Barriers to Trade (TBT) of the World Trade Organization.