Reserve alum mixture in bin to use over several days.
Marbling kit instructions.
The floating paints are swirled into patterns.
A mordant must be used on paper and fabric so that the marbled design will adhere to the fiber or paper quickly and permanently.
The technique involves floating paints on the surface of a gel like medium known as the marbling size and then transferring this floating design onto paper or fabric.
Alum treated fabric or paper should be used within 2 days or placed in an airtight container or bag as the alum deteriorates and also can rot.
Pretreat fabric or paper with mordant.
Using the correct acrylic body marbling paint is extremely important.
Jacquard marbling instructions for a succinct visual guide from jacquard click here.
These marbling kits are made for decorating objects and not people and can even be hazardous.
Mix 3 tablespoons alum per quart of hot tap water in a bin.
Then you capture your design by laying a treated piece of fabric or paper down on top of the paint to transfer the swirls to the fabric.
I would strongly advise to buy a full kit that comes with everything you need to start body marbling.