White cupcake case success?

I think i may have finally found the white cupcake cases for vintage themed wedding cupcakes.
 
I tried these Culpitt cases (which are the only white cupcake cases Surbiton Sugarcraft sell) with the last Herman cake cupcakes and despite the mixture being a dark, chocolate colour i got very little discolouration and virtually no oil seepage. I think with a lighter colour sponge they will stay white! Fingers crossed!