Have just made some cupcakes using Sainsbury's spotted cake cases (they are on offer at the moment and I think they may be new). And the red coloured cases seem to have stained my bun tin!!
Is this common? I normally use the plain ones.
Other than the fact my expensive best tin (cost £16) is now stained, I am slightly concerned that this would have gone into the cakes.
Do you think I should go back to Sainsbury's and complain?