View Full Version : PE question....

07-04-2009, 08:41 PM
Over the years I was always curious about the HSIE emulsion and how it was made.

In the dark your sense of smell is allot more keen and I was always curious as to why this emulsion smells like Anise or Liquorice? any connection??


John Shriver
07-05-2009, 09:41 PM
Never handled High Speed Infrared, but I certainly understand films with distinctive smells. Kodachrome is definitely distinctive. I think High Contrast Copy is as well.

HIE uses a unique (and expensive) sensitizing dye to give it IR sensitivity. It's quite unstable over time, the film has lousy shelf life. So the decomposition of it may give off the distinctive odor you have noted.

It will be interesting to see if Ron knows (or is allowed to say) what the dye is. (It may be a trade secret.) I think Kodak had to synthesize it themselves.

Photo Engineer
07-05-2009, 10:01 PM
It might involve one of the chemicals or solvents used in production. IDK. I never worked with any of the IR Emulsions except as a "customer" in the USAF.