Use only food paste, not liquid food coloring sold in the grocery store.

2 quarts popped popcorn
2 tablespoons melted butter, divided
Red food paste
Orange food paste

Divide the popcorn between two large bowls. Add a little red food paste to 1 tablespoon melted butter, stir well, and drizzle over popcorn. Stir gently to spread the color throughout the popcorn. Repeat with the orange food paste with the popcorn in the second bowl. Gently mix both popcorns together.