1. Some alum is dissolved in water. This is sponged
onto each paper to be marbled, and the paper is allowed to dry. The alum
is what will bond the color to the
paper.
2. A thick liquid, referred to as the size, is made by blending a type of gelatin (carrageenan) with
water.
3. The size is poured into a shallow tray.
4. Several colors of ink or paint are sprinkled onto
the surface of the size. They float on the surface because they are
lighter than the thickened
water.
5. A stick is used to stir the floating colors if
desired. Various combs and rakes may also be run through the colors to
make more intricate
patterns.
6. A sheet of the alum-treated paper is gently laid
onto the surface of the size, and it absorbs the floating colors. Only
one print can be
made.
7. The paper is lifted off, rinsed, and hung up to
dry.
Fabric marbling is done the same way, except for step #1: Instead of
sponging the alum onto the cloth, it is soaked in the alum water, then
hung up to dry, then ironed flat. After that, it can be marbled just
like a sheet of paper.