6 thoughts on “Fifty Shades of Blue

  1. My guesses as to pigments. Left three phthalocyanines, probably 15:3, 15:2 and 15:1: the fourth could be 15:6 or possibly indanthrone, Pigment Blue 60; the final one looks like ultramarine Pigment Blue 29. Are there any paint/ink/plastic nerds here with other opinions?

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