Instructions: In this task, you're given a review from Amazon's food products. Your task is to generate a short summary of the given review in the input. Note that you don't need to write a complete sentence as a summary.
Input: I purchased this food coloring hoping it would create black frosting. I read several reviews on this and other websites which suggested I use chocolate icing (as white icing + black food coloring= gray frosting) but this product did not darken the chocolate at ALL. I ended up using over half for one cake and still decided the color wasn't right. It was still obviously brown. Perhaps my expectations were too high.
Output:
Waste of money