ASTM D 50 - 90 (Reapproved 2005) Standard Test Methods for Chemical Analysis of Yellow, Orange, Red, and Brown Pigments Containing Iron and Manganese

American Society for Testing and Materials (ASTM). Current edition approved Sept. 1, 2005. Published September 2005. Originally approved in 1917. Last previous edition approved in 1999 as D 50 – 90 (1999). 5 p. 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.