Notes & Queries. (1883) Gaffard's Non-Erasible Ink. (vastaus)

The Manufacturer and Builder 8, 1877

You probably mean Gaffard's preparation. It consists simply of lampblack mixed in twelve times its weight of silicate of potash, to which a lit-tle liquid ammonia is added, and the whole diluted with water so as to increase its bulk about three times.

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