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ASTM D50-90(2005)

ASTM D50-90(2005)

Standard Test Methods for Chemical Analysis of Yellow, Orange, Red, and Brown Pigments Containing Iron and Manganese

2011-06-17 /Historical
Superseeded by:
Significance and Use:

These test methods compile in one place, recommended procedures for analyzing inorganic colored pigments. These pigments are used extensively in paints, and for this reason their compositions are important to the formulators and user.


1.1 These test methods cover procedures for the chemical analysis of yellow, orange, red, and brown pigments containing iron and manganese. The test methods apply specifically to the following pigments: synthetic hydrated yellow iron oxide, yellow ocher, red and brown iron oxides, raw and burnt umber, raw and burnt sienna, and venetian red.

1.2 The analytical procedures appear in the following order:

Dry PigmentsSections ences
Moisture and Other Volatile MatterD 280
Loss on Ignition
Coarse Particles D 185
Matter Soluble in WaterD 1208
Organic Coloring Matter
Iron Oxide and
Calcium Compounds (Reported as CaO) and
Sulfates Soluble in Hydrochloric Acid and
Lead Chromate (in Ochers)
Calcium Carbonate (in Venetian Red)C 25
Manganese (in Siennas and Umbers) and
Pigment Pastes in Oil
Pigment Content D 1208
Moisture and Other Volatile MatterD 1208
Nonvolatile Matter in Vehicle
Moisture by Distillation D 1208
Coarse Particles and Skins D 185
Consistency (Stormer) D 562

1.3 &solely-SI-units;

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.

brown pigment (iron and manganese); calcium; colored pigment; iron oxide; red pigment; soluble sulfate; yellow pigment
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