For a make-it yourself fire retardant mixture, mix 7 oz. Borax, 3 oz. boric acid, and 2 qts. warm water. Stir to dissolve completely. Either dip the fabric in the mixture or spray on to thoroughly saturate the material until it drips. This product will wash right out without damage to the fabrics so if you have to use a bedsheet for stage curtains, it won't damage them for at home use.
Source: Drama team
By fossil1955 from Cortez, CO
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Making children's clothing flame retardant: Mix together nine oz. 20 Mule Team Borax and four oz. boric acid in one gallon water.