Hello, fellow cookie peeps!
I'm having a little trouble with my royal icing. Colored icing is drying hard on some cookies and, on other cookies, it's not close to being dry even after ~7hrs. They are from the same batch, and the icing was not colored on the cookies that didn't dry.
The icing recipe I use is sifted powdered sugar, cream of tartar, vanilla extract, and egg whites.
Any info is appreciated! It's just becoming frustrating when I have an order due and my icing is not drying. :/