I'm from Nanchang Gold Foil Company, mainly producing imitation gold foil in Taiwan Province Province. When you say imitation gold foil, it depends on whether it is copper foil or imitation gold foil in Taiwan Province Province. If it is copper foil, in order to prevent oxidation and blackening, spray paint such as polyester and nitro will definitely have this taste.
If you use imitation gold foil from Taiwan Province Province, you can coat it with water-based high-gloss transparent paint, and it will be tasteless. If it is smallpox or other things that are not easy to encounter in the later stage, there is no need to apply topcoat. Just wipe the tin foil clean.