The size is poured into a shallow tray. Fill pan with size solution
to a level that can be pierced with the stylus or teeth of the comb,
usually 1/2" to 1" deep or as much as 2" - 3"
Skim size with newspaper strip first to reduce the
surface tension and eliminate any dust or air bubbles.
Just before adding the paints, skim off
any film that has formed on the surface of the "size"
by dragging a strip of newspaper from one end to the other.
Size should always be still. Splashing the size and abrupt movements
of the pans should be discouraged.
Size is spoiled if it becomes watery and/or develops a fishy smell