Mix red food coloring with blue food coloring until you get purple
Start with a small amount of blue and add red gradually
Adjust the ratio to make the purple lighter or darker
Use gel food coloring for more concentrated color
Use liquid food coloring for easier mixing
For natural purple, use beet juice, blueberry juice, or purple sweet potato powder
Strain natural colorants before using them in food
Add a tiny amount at a time to avoid overcoloring
Mix thoroughly after each addition
Test the color on a small sample before using it in the full batch