When was silver iodide introduced in film emulsions?

When was silver iodide introduced in film emulsions?

I'm curious as to when it was used and by which company first? And how long until others followed?

If you consider direct positive prints as "film" emulsions too, than Hyppolyte Bayard's process in the early 1830's would be the starting point... IDK about film on flexible acetate base.

See also this thread I started on Hyppolyte:
(there was a url link here which no longer exists)

And this interesting attempt to reproduce his results by Tania Passifiume:
Dead Link Removed

Marco

Great info! But yes I want to know specifically about neg film on flexible transport

Well the first films on flexible celluloid support were made in by Carbutt 1884, in Philadelphia, and the first from a major film company were Perutz in Germany not long after. The early Kodak cameras used paper negatives not film as the base but the use of daylight loading roll paper negative holders goes back to 1854, (the first Patent) and Captain Barr 1855, and M. Renlandin who showed his roll film holder to the French Photographic Society in the same year..

Potassium Iodide is included in faster Silver Gelatin emulsions by the 1890's, I've no formulae at hand earlier than that, but it must have been used prior to that.

Ian

The first dry plate went on the market in 1877, manufactured by J.W, Swan. W. de W. (Captain) Abney advocated the use of Bromo-iodide emulsions around 1880, and the BJP published a Bromo-Iodide emulsion by W.K. Burton not long after, they also published an Abney emulsion with no Iodide.

Most of the articles were published in Britain in magazines like The British Journal of Photography and The Photographic News, and later reprinted in US journals like Scientific American.

Ian