Start with a base color that matches the skin tone you want
Mix in a small amount of red for warmth
Add yellow to create a natural undertone
Add white to lighten the tone
Add brown to deepen the tone
Add a tiny amount of blue or green to reduce excess warmth if needed
Adjust gradually in very small amounts
Test the color on a separate surface before final use
Mix until the tone looks balanced and natural
Keep notes of the ratios for future matching