Morse's manual of art : a self teacher in all branches of deocrative art, embracing almost every variety of painting and drawing, on china, glass, velvet, canvas, paper and wood : the secret of all glass transparencies, sketching from nature, pastel and crayon drawing, etc. : illustrated (1884)
Morse, D. D · Chicago : [D.D. Morse] · leaf 187
k the outlines of what black is to come out through the var- nish ; take some thick brown paper, dip it in water, and squeeze it gently, spread it over the parts of the varnish you want to de- tach from the glass, and in a few minutes, by raising one edge of the black, it will instantly peel away…
Painting · Drawing · Decoration and ornament
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.