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Hello Allan,
I love painting tools and I'm very impressed that you made this, out of copper, no less!
Would you not get the same proportional accuracy if you just pushed out a long line of white along a ruler, and added a similar line of contrasting color? You would adjust the amount of your contrasting color as you go up or down the tonal scale.
I used to tube grays made from contrasting colors on the Munsell color chart, using this system to ensure a 50% white/50% color (or whatever got me to a midtone grey, depending on color intensity) mix.
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