1.1 This specification covers the red pigment commercially known as pure para red toner. It is available in two Types: Type I, light, and Type II, dark.
ASTM D475-67(1996)e1 Referenced Document
ASTM D970 Standard Test Methods for Para Red and Toluidine Red Pigments*, 1999-01-01 Update
ASTM D475-67(1996)e1 history
1996ASTM D475-67(1996)e1 Standard practice for determining conformance to specifications for geosynthetics