Make a saturated solution of alum, water, which means to dissolve as much alum in hot water as possible.

Lay the glass on a perfectly level table and pour on as much of the alum water as you can without its running off and let it cool slowly, when the alum will cover the glass with fine crystals. This is a good substitute for ground glass.

A cheap frosting for windows can be made by dissolving Epsom salts in hot water and then mixing it with a clear solution of gum arabic.