Anonymous, The boy's book of trades and the tools used in them (1866)
“ After the whole surface is carefully skewed, or gone over with the brush which removes the ragged edges and still further presses the gold into the ornaments, the frame is well dusted with another soft brush, and then sized with clear size, after which the work is complete.Supposing however that any part of the frame is to be of burnished gilt, the clear cole and the oil gold size must not be suffered to touch that portion,—burnish gold size, a substance made of grease, clay, black lead, red chalk, and bullock’s blood, is used instead of the oil gold size. ”
