Mix red, yellow, and blue food coloring in equal small amounts
Add more red and yellow if the brown looks too cool or muddy
Add more blue if the brown looks too warm or orange
Start with a tiny amount of each color and adjust gradually
For a darker brown, add a little black food coloring
For a lighter brown, mix in more of the base mixture or white frosting if applicable
Use orange plus a small amount of blue for a quick brown
Use red plus green for a brown tone
Use yellow plus purple for a brown tone