Item #8838 The Secret Science of Covert Inks. Samuel Rubin.

The Secret Science of Covert Inks

Port Townsend: Loompanics Unlimited, 1987. Edition Not Stated. Presume first edition. Paperback. 8vo., 128pp. Fine. Item #8838
ISBN: 091517944X

Sample Recipe: 'Chinese Red Secret Ink'. Used by agents of the Chinese Ministry of Public Security, this ink is made by mixing one part each of phenolphthalein, glycerin, alcohol, and carbon tetrachloride. When dry, it is colorless, but upon application of ammonia, it turns reddish. It disappears again when the ammonia vaporizes. This is used as a printing ink and messages are placed on the back of and sometimes between the lines of routine public bulletins.

Price: $30.00

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