Answer:
The process for making gray begins by mixing blue and red pigments in more-or-less equal proportions to produce purple. Use more blue to keep the mixture cool and more red if you want a warm color. Adding yellow pigment turns the paint gray, and the more yellow you use, the lighter the mixture will become.
Explanatio
A circa 1850 "Hillotype" photograph of a colored engraving. Long believed to be a complete fraud, recent testing found that Levi Hill's process did reproduce some color photographically, but also that many specimens had been "sweetened" by the addition of hand-applied colors.
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Answer:
i dont know sorry pls dont be mad at me
