While we can't speak for any other brand of icing sheets out there, and although we recommend keeping the images you print on our Frosting Sheets (also known as icing sheets) sealed in a zip lock bag at room temperature until you apply them to your cakes, we've found that several cake artists have successfully and frequently stored their cakes in their fridges with our Frosting Sheets already applied to their cakes.
Although we don't officially recommend or guarantee that your colors will remain intact after going through a fridge for extended periods of time, it doesn't hurt to push limits, see what's possible and stay informed. Let's take a look below at an experiment Gianna (@gbaby.cakes) carried out over the course of 9 days. Yes you read that right, she left a cake which she decorated with an Oprah image she printed with our edible ink on our sheets, adhered it with some shortening to a buttercream cake and stuck it in her fridge uncoveredfor 8 whole days. (FYI: "Shortening" is a fat that is solid at room temperature and basically contains no water content. It usually results in more tender and softer dough.)
Gianna took the cake out of her fridge on day 9, and according to her observations, her printed image was virtually intact.
What does this say about the quality of our edible ink and our Frosting Sheets? You tell us. Do you HAVE to refrigerate icing sheets? No. As mentioned above, we actually don't officially recommend or guarantee that your colors will remain intact. Can you refrigerate icing sheets? It seems the answer to that question, at least with our products, is a resounding yes. Then again... it may just be that Oprah is so fabulous that any image of hers just doesn't fade. You decide.
There are, of course, several variables that we can't account for if you were to be confident enough to trust your fridge to correctly store your prints (such as the condition of the fridge, the temperature settings, etc.), but storing cakes in fridges with printed edible art already applied to the cakes has been done before and still happens regularly among users of our products.