Mixing metallics with regular paints? Stay metallic-heavy. Even a little matte paint can kill the shine fast, so tint metallics in small steps and test as you go.
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Scale Model Paint Mixer — BRICK: C59 Orange 53% + C7 Brown 27% + Gaia Pure Magenta 20% (≈ indistinguishable). A free app that gives you a paint recipe from the paints you already own.