Alum

Alum is for pre-treating fabric before marbling so designs transfer well. Dissolve 1 cup of alum in one gallon of water and add 4 teaspoons of calgon. Immerse fabric in solution until wet, wring out, do not rinse, and air dry. Fabric will be ready to marble when dry.Alum is for pre-treating fabric before marbling so designs transfer well. Dissolve 1 cup of alum in one gallon of water and add 4 teaspoons of calgon. Immerse fabric in solution until wet, wring out, do not rinse, and air dry. Fabric will be ready to marble when dry.