terchloride

The impression developed with gold terchloride is pale blue, _quite permanent_, and does not at all interfere with the work of the artist.

Photographic Reproduction Processes Peter C. Duchochois

The terchloride of gold is most uncertain in its results, at any rate I find it so.

Notes and Queries, Number 207, October 15, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. Various 1852

He says: "Using the most convenient salt of gold, the terchloride, and employing wood as the decomposing agent, in order to imitate as closely as possible the organic matter supposed to decompose the solution circulating through the drifts, I first immersed a piece of cubic iron pyrites taken from the coal formation of Cape Otway, far distant from any of our gold rocks, and therefore less likely to contain gold than other pyrites.

Getting Gold: a practical treatise for prospectors, miners and students