ROYAL ICING FOR COOKIES AND CUPCAKES

ROYAL ICING FOR COOKIES AND CUPCAKES
1 1/2 cups pure icing sugar, sifted
1 eggwhite
1/2 teaspoon lemon juice

I mix everything together to stiff peaks. Then if I want it medium or runny, add a teaspoon of water at a time.
Also, I don’t use liquid colour, rather gel or powder.
Also agree with Kiti, could be humidity or the fact that it was directly on the cake. I have only ever iced biscuits and on fondant,
Also, keep covered in a tupperware, or it dries out.
It sounds like your mixture might have had too little icing sugar also?

Recipe and photo:  Sa-eeda Daniels
2nd photo:  Debbie Edwards