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Originally from John Glasswicks article Gerb Colours found in the PGI Anthology. The red, green and blue gerb formulas can be mixed in the ratios shown below to produce other colors:
Yellow = 25% red, 75% green
Orange = 60% red, 40% green
Chartreuse = 14% red, 86% green
White = 14% red, 28% blue, 58% green
Purple = 60% red, 40% blue
Aqua = 25% blue, 75% green
