Mix red, yellow, and blue food coloring in equal small amounts
Add more yellow if the brown looks too dark
Add more red if the brown looks too green
Add more blue if the brown looks too orange
Start with a light base and adjust gradually
Mix complementary colors like red and green
Mix orange and blue
Mix purple and yellow
Combine chocolate or cocoa powder with food coloring for a deeper brown
Use tiny amounts of black food coloring to darken the shade if needed