Some artists add eggwhite or the whole egg to casein to make it harder. Polymer A relatively new medium is polymer, the general name for all kinds of plastic colors, which are marketed under various trade names. Prepared from mostly diverse combinations of acrylic and vinyl, these colors are applied with water, but dry almost instantly and dry waterproof. They can be handled like watercolors or oils, in any technique, thick or thin, opaque or transparent. They can be varnished with plastic varnishes, a feature which makes polymer paintings or objects painted in polymer literally scuffproof.
Polymer is employed in commercial fields as well as in the fine arts.
It works on any surface, except an oily one. The only advantage of oil based polymer over regular oils is that the polymer dries faster. We Use Pigments are the coloring matter we need for paints. They must be substances which can be powderized so that they can be mixed with a liquefied binder. Earth Colors Earth colors are not really made of earth.