Hi! I decorate a lot of cookies with royal icing but get inconsistent results with the finish on the cookies once they are dried. Sometimes they have a beautiful sheen, other times they dry to a matte finish. I adjusted the amount of liquid used, the temp. of the water used, and how long I beat the icing but I still can't figure out what makes the difference. Does anyone out there know how I can get a shiney royal icing?