Cornstartch works really well. Add in a tablespoon or two then stir. If it feels closer to what you want then you can just cover it up and let it sit a while to thicken some more. If you think it needs more, add more then let it sit. While it sits the cornstratch will absorb the extra liquid.
Well, since we are on the subject of royal icing, I just mixed up a batch of Wilton RI and it was really stiff. Since I am not going to use it until tomorrow (I want to practice flowers) I put it in a container with some moist (not dripping) paper towels on top of the icing, under the lid. Will this be okay?
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