warm frost
Mix several teaspoons of Epsoms salts with one half cup
water in a small pan. Epsoms salts is the chemical magnesium
sulfate and can be purchased at a drug store. Heat the water
to just below boiling. Stir in as much Epsoms salts as will
dissolve. Add several drops of white glue and stir. Allow the
liquid to cool somewhat. When it is still very warm pour onto
a pane of glass or a glass baking pan. Spread the liquid to a
thin, even layer. As the water evaporates frost like crystals
will appear on the glass.