SIZE SKIMMER.
This is a piece of wooden board about 2 inches high, about 1/4 inch thick and of the exact width of the trough. At both ends the board is slightly wider than the trough, protruding, and while the larger part of the board moves over the surface of the size, the projecting ends act as guides by sliding over the rim of the trough. In this way the board is always kept in a like position and serves to remove the air bubbles and films and also the color waste.
Recently, strips of blotting paper 1 inch wide have been frequently and successfully used for the removal of waste of color. They are applied in the same manner as the board.