How and how long before eating the cake should be placed the edible sheet

To the question of how long before eating the cake the edible sheet should be placed, there is no one answer that applies to all cases because it depends on the type of cake. That is, the more moisture the cake has, the more and faster it will affect the colors of the edible sheet. For example, if placed on whipped cream that has enough moisture, it may "moisten" and the colors will change if left for more than 1-2 hours. That is why it is recommended  edible sheet to be placed just before the cake is cut. To extend the strength of the edible leaf we can put buttercream or chocolate or ganache between  sheet and the whipped cream or cream, so as to reduce the chance of moisture appearing in the photo and to last much longer.

Also when you have applied the edible sheet to the cake and you want to place it in the fridge, then it is better not to put it in a box (when it is in a box it accumulates more moisture and the colors of the image may be affected faster ..)

Of course, each confectioner has developed his own techniques for applying the edible sheets and there are other ways, as well as other factors that can affect the color fastness of the cake, such as the humidity of the refrigerator and the ingredients used by each company for the production of edible sheets.

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