Greenlaws Process

Greenlaw's Process, a photographic process for obtaining- a "positive" print upon paper, or it may be nsetl for the production of negatives by waxing the paper after printing. The process is carried out in the following manner: - The paper is coated with a solution in water of potassium bromide and iodide, with some free iodine, and is then allowed to dry. It is next immersed in a solution of silver nitrate and acetic acid, being afterwards washed and dried. This is then placed in the camera or in the printing frame and exposed. After exposure it is developed by a strong solution of gallic acid with a little silver nitrate. It is next well washed and fixed by sodium hyposulphite. The process is more suitable for negatives than for positives, but is not of frequent usage among photographers at the present time.