Mix red, yellow, and blue food coloring in equal small amounts
Add more red and yellow for a warmer brown
Add more blue for a cooler brown
Start with a light base and add color gradually
Use a tiny amount of black food coloring to deepen the brown if needed
Mix orange with a small amount of blue for a quick brown
Mix red with green for a muted brown
Adjust the shade by adding more of the dominant color
Stir well after each addition until the color is even