Product Description Alizarin Permanent Alizarin Permanent (PR-177) , a Series 4 color, replaces Alizarin Crimson (PR 83) in the R&F color line. Alizarin Permanent is a deep, transparent red, a lightfast alternative to Alizarin Crimson (PR-83). Opacity: Transparent Pigment Stick Drying Rate: Slow Classification: Organic Color Index: PR177 Chemical Composition: anthraquinone Safety Information: Conforms to ASTM D-4236