Question about phosphors

[earlyfilm]

Originally Posted by Rinehart

"as a service technician knows, it is rare to find two phosphors that have the same colour."

For those of you too young to remember the early B&W days of TeeVee, each manufacturer made slight variations in the phosphor color and in the exact color and exact density of the safety glass, so they could claim that their sets produced the best picture!

This was mostly a sales gimmick. Most CRT's started out their life as a bluish white, and aged to a slightly warmish brown color with use. The public took this as normal.

Thanks for the link to the article, as I've never seen the mention of filter density in the Peter Goldmark system, just the Kodak or Wratten filter color number, and knew that surviving CBS color filters did not match the published Wratten numbers.

These are the same color filters used then and still today for reproduction of color with B&W film.

The mention of an overall yellow filter by the author is counterproductive. It would be far more efficient to reduce the saturation of the complimentary color, blue. Me thinks that he was attempting to create a one-color-wheel-fits-all system.


For an introductory look at photographic color filters, see:

http://en.wikipedia.org/wiki/Wratten_filter

James