Colour Index: PB15
Notes: Staining Colour
+++ = at least 100 years lightfast under museum conditions
++ = 25 - 100 years lightfast under museum conditions
+ = 10 - 25 years lightfast under museum conditions
0= 0 - 10 years lightfast under museum conditions
The lightfastness of all these colours has been tested in accordance with ASTM Standards D4303
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- Rembrandt Artists' Watercolours
- Phthalo Blue Red