Film-Tech Forum ARCHIVE: Cyan Track Question

This is topic Cyan Track Question in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Mitchell Dvoskin (Member # 751) on 02-24-2004, 08:56 AM:

Does the Cyan track fail to block the ultraviolet or infer-red spectrum?

Posted by Greg Mueller (Member # 17) on 02-24-2004, 09:05 AM:

It fails to block infrared

Posted by Mitchell Dvoskin (Member # 751) on 02-24-2004, 09:15 AM:

Thanks...

Posted by John Pytlak (Member # 331) on 02-24-2004, 09:28 AM:

Here are the spectral dye density curves for the cyan, magenta, and yellow dyes in Kodak VISION Color Print Film 2383:

http://www.kodak.com/US/plugins/acrobat/en/motion/products/curves/ti2397d.pdf

Note the cyan dye has peak density at about 660 nanometers, so a red LED is a good match for optimum signal from the cyan dye. The dyes are all fairly transparent to infrared and ultraviolet energy.