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Developing Solution

This were soaked for 2 days in a bath of sulphate of may be made in stock solution of the simple copper, when the picture was found to be sulphate of iron and water, and then reduced more developed. After several rinsings in in strength and made ready for use each day. | water, and two days' exposure on the grass, For the stock solution take water, 16 ounces; the rest of the goods were bleached white, sulphate of iron, 4 ounces.

Dissolve and fil- leaving the picture of a pure violet tint on a ter. When wanted for use, take stock solution, 1 ounce; water, 4 ounces; acetic acid (No. 8), ounce. The addition of about + ounce alcohol to the above formula often facilitates the smooth flowing of the solution on white background.