ASTM D5724-16 (R2021) pdf free download.Standard Specification for Gouache Paints.
1.1 This specification establishes requirements for composition, physical properties, performance. and labeling of gouache paints.
1.2 This specification covers pigments. vehicles, and additives. Requirements are included for pigment identification, lightfastness, and consistency.
1.3 Table 1 lists some pigments meeting the lightfastness requirements in this specification. In order to identify other pigments that meet these requirements, instructions are given for test specimen preparation. Test methods for determining relative lighfastness are referenced.
1.4 The values staled in SI units are to be regarded as the standard. The values given in parentheses are for information only.
3. Ternunology
3.1 Definitions:
3. 1 . 1 colour index name, n—consists of thc category (type of dye or pigment), general hue, and an assigned number given to a colorant in the Colour Index3 as an international identification system.
3.1.1.1 Discussion—For example, the Colour Index Name of one phthalocyanine blue pigment is Pigment Blue 15 (PB15).
3. 1.2 colour index numbe,; n—a five-digit number given in the Colour Index that describes the chemical constitution of a colorant.
3.1.2.1 Discussion—For example, the Colour Index Number of one phthalocyanine blue pigment is 74160.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 gouache paint, n—a pigment dispersion in a water soluble gum/resin vehicle that dries water soluble and is formulated primarily for relatively opaque and matte applications.
3.3 Appearance terms used in this standard are defined in Terminology E284.
4. Significance and Use
4.1 This specification establishes quality requirements and provides a basis for common understanding among producers, distributors, and users.
4.2 It is not intended that all paints meeting the requirements be identical nor of uniform excellence in all respects. Variations in manufacture, not covered by this specification. may cause some artists to prefer one brand over another, either of which may be acceptable under this specification.ASTM D5724 pdf download.