This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
Below are instructions on making a red stencil ink for marking boxes, etc. Get 3 1b. of pure pipeclay (not a mixture of pipeclay and whiting), and crush or scrape into a fine powder. Make a stiff mixture of Indian red in water, scrape a few shreds of soap into the Indian red, and mix well. Now gradually add the pipeclay until the mixture is of the consistency of putty.' Then make it into cakes, and dry with gentle heat for use.