Platinotype printing : a simple book on the process (1899)
Hinton, A. Horsley (Alfred Horsley), 1863-1908, author · London : Hazell, Watson & Viney, Limited · leaf 48
Platinotype Printing. 40 to enclose some air-bubbles, which, by preventing those portions of the paper from reaching the solution, result in undeveloped spots and patches. … Hence it were better to hold the paper vertically or in an inclined position in both hands, holding each end with the finger-tips of the left and right hands respectively, and then, placing the end held in the
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
