Alum Mordant Marbling. Remember that alum is the compound most commonly used to mordant both fabric and paper. Alum mordant for paper marbling. Not for human consumption.
Alum or potassium aluminum sulfate is a chemical often used as a food preservative. Without a mordant the pigments will slide off the paper.
Alum this is mixed with hot water as a mordant to get the finished pattern to stick to the paper or fabric being marbled.
This video demonstrates the recipes and techniques necessary for aluming paper in preparation for marbling. Make enough solution to cover your fabrics. Used as a color binder in marbling. Alum is also used in dyeing as a mordant.
