Dicyanin (synthetic dye)
Dicyanin is a synthetic blue dye derived from coal tar that was used for sensitizing photographic plates, first manufactured in the early twentieth century by the Dye Works of Meister, Lucius, and Brüning at Höchst (near Frankfurt), Germany. It became associated with auric research thanks to the experiments of Walter J. Kilner, who used the dye in the manufacture of his Kilner screens.
- Kenneth, C. E.; Wratten, S. H. (January 1908), "Plates Sensitised with Dicyanin and Photography of the Infra Red", The Photographic Journal (London: Royal Photographic Society of Great Britain) 32 (1): 25-37, https://babel.hathitrust.org/cgi/pt?id=coo.31924078270059;view=1up;seq=37
- Merrill, Paul W. (April 1919), "Application of Dicyanin to the Photography of Stellar Spectra", Bulletin of the Bureau of Standards (Washington, D.C.: U.S. Dept. of Commerce) 14 (4): 487-505, https://catalog.hathitrust.org/Record/009487742
- "Dicyanin", Scientific Papers of the Bureau of Standards (Washington, D.C.: U.S. Dept. of Commerce) 17 (422): 366-367, 1922, https://babel.hathitrust.org/cgi/pt?id=mdp.39015010797002;view=1up;seq=472