I flooded a cookie shocking pink, let it dry. Then airbrushed it with pink sheen. After that had dried wrote on it with white piping. After that was completely dry, I kept it in cello bags in an airtight box. When I opened the box today to wrap and put away in a box, the pink had run onto the white (lettering).
Why has that happened. I have to now re make most of them and am worried it will happen again.
Please help.