Yellow paint
Small amount of brown paint
Tiny amount of red paint
White paint for lightening
Mix yellow with a little brown
Add a tiny touch of red
Add white until the shade looks metallic gold-like
Adjust with more yellow if it becomes too dark
Add more brown if it looks too bright
Add a small amount of metallic gold pigment or gold mica powder for a true gold finish
Stir thoroughly until smooth
Test on a sample surface and adjust as needed