Royal icing is unlike most other icings. It can dry out quickly if you let it, ruining your chance to use it. Don't let that ...

Piping bags for icing The tools you’ll touch the most when creating your royal icing designs are likely the piping bags: conical plastic bags that you fill with icing and then attach to piping tips.

Estimations for how long you need to let royal icing dry vary, but you should typically let it sit for at least this long.