What’s the difference between Phthalo Blue (Green Shade) and Phthalo Blue (Red Shade)?

Getting from PBGS to PBRS

Phthalocyanine blue (PB15) is an incredibly intense, staining, transparent, non-granulating, lightfast pigment that comes in two versions:

  • Phthalo Blue Green Shade (PB15:3)
  • Phthalo Blue Red Shade (PB15:6 or PB15:1)

(I’ll call them GS and RS in this post.)

What’s the difference, and which should you choose?

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