I would strongly advise to buy a full kit that comes with everything you need to start body marbling.
Marbling kit instructions.
The ancient art of paper marbling has historically been associated with the book arts.
Pretreat fabric or paper with mordant.
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 floating paints are swirled into patterns.
Marbling is the process of floating fabric paints on the surface of a thick cellulose solution called size somewhat like oil on water.
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.
Jacquard marbling instructions for a succinct visual guide from jacquard click here.
Using the correct acrylic body marbling paint is extremely important.
Reserve alum mixture in bin to use over several days.
Mix 3 tablespoons alum per quart of hot tap water in a bin.
These marbling kits are made for decorating objects and not people and can even be hazardous.