3.1 These test methods are suitable for determining if impurities are present and establishing that the required pigments are present. These test methods may be used for manufacturing quality control.

1.1 These test methods cover procedures for the chemical analysis of blue pigments known commercially as iron blue, copper phthalocyanine blue, and ultramarine blue.

1.2 The analytical procedures appear in the following order:

Sections

IRON BLUE PIGMENTS

Identification

 6

Moisture by the Brabender Moisture Tester

 7 and 8

Moisture by Toluene Distillation

 9

Water-Soluble Matter by Extraction

10

Water-Soluble Salts by Electrical Conductivity

11

Detection of Acid-Insoluble Extenders

12 and 13

Detection of Acid-Soluble Extenders

14 to 17

Detection of Organic Colors and Lakes

18

COPPER PHTHALOCYANINE BLUE PIGMENTS

Identification

19

Moisture and Other Volatile Matter

20

Detection of Basic Dye Derivatives

21

Detection of Other Organic Coloring Matter

22

Detection of Ultramarine Blue

23

Detection of Iron Blue

24

ULTRAMARINE BLUE

Identification

25

Moisture and Other Volatile Matter

26

Water-Soluble Matter

27

Detection of Basic Dye Derivatives

28

Detection of Other Organic Coloring Matter

29

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address the safety concerns 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.