QUESTION: What's the difference between Phthalo Blue (GS) and Phthalo (RS)? Thanks!
SUSIE'S REPLY:
Phthalo Blue (GS) green shade PB 15 A cool blue slightly bias toward green
ASTM Lightfastness Rating: Excellent
Transparency: Transparent
Granulating: No
Staining: Staining
Phthalo Blue (RS) red shade is also made with PB 15 but has been altered to lean more toward purple than green. Compare this color to French Ultramarine Blue. You get the same look without the sedimetary properties.
ASTM Lightfastness Rating: Excellent
Transparency: Transparent
Granulating: No
Staining: Staining
SUSIE
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