I know I read a trick once for doubling up cupcake liner cups so they retain their color. Do you bake them in two liners or do you bake them in a white liner and then frost them into another fancier one?
I bought some "greaseproof" liners on Etsy but they still bled through.
AI bake them with two liners. The outer one seems to stay closer to the cupcake. If you want the outer liner to stick out a ways, add it later.