An Illustrated Guide to Royal Icing Consistency by SemiSweetDesigns.com

Achieving the right royal icing consistencies is the hardest yet the most important part of cookie decorating. It's also quite difficult to describe in words how royal icing consistency should be. That's probably the main reason I've put off writing about it for so long. Nailing the correct royal icing consistency isn't an exact science. It's more of a "feel" and becoming more familiar with how royal icing behaves under different thicknesses.