Standard Practice for
Visual Evaluation of Metamerism1

This standard is issued under the fixed designation D 4086; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This practice describes visual methods for detecting
metamerism and for estimating the magnitude of a metameric
color difference.

1.2 The practice is limited to the consideration of illuminant
metamerism and observer metamerism. It is not designed to
cover so-called geometric metamerism, in which members of
specimen pairs change relative appearance as the angles of
illumination and viewing are changed, for example, because
they incorporate flake metal or pearlescent colorants.

1.3 This practice does not provide for the computation of
indices of metamerism based upon instrumental measurement
of spectral characteristics.

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.

2. Referenced Documents

2.1 ASTM Standards: 2

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