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To Write Black Characters are mixed together

Ivory and bone should with Water. Thoroughly dry and reduce be placed in very weak nitric or hydrochloric Water.

Thoroughly dry and reduce be placed in very weak nitric or hydrochloric to a very fine powder a mixture of 4 parts acids before being immersed in the ammonianut-galls, and 1 part calcined sulphate of iron; cal liquid; wood cannot be dyed by this lirub it over the surface of the paper, then quid unless it has been previously painted forcing it into the pores by powerful pressure; over with paste made from flour. When to brush off the loose portion, and a pen dipped the ammoniacal liquid some gelatine solution in water will write black. be added, it may serve as a red ink which does not attack steel pens. By varying the 1978. To Write Blue Characters with Water. Prepare the paper with a proportions of the magenta and picric acid, mixture of sesquisulphate of iron and ferrocyanide of potassium, by the same method as the last receipt. Write with water as before, and the characters will appear blue.

1979. To Produce Brown Writing with Water. Instead of the sulphate of iron in the last receipt, use sulphate of copper; and characters written with water will be reddish-brown.

1980. To Write Blue with a Colorless Fluid. Wet the paper with a solution of ferrocyanide of potassium, and dry it again; write on it with a pen dipped in a solution of sesquisulphate of iron, and the writing will be blue. the tints obtained may be varied from a bluish red to a bright orange-red. The colors do not appear until the ammonia is evaporated.