Special Dye Color Filters
Color filters that incorporate rare dye materials. Used to alter the color wavelength of light.

Filter No.               Description/Usage
3                             Light yellow. Absorbs excessive sky blue.
9                             Deep yellow. More dramatic than No. 8
21                           Orange. Contrast filter for blue and blue-green absorption.
26                           Red
32                           Magenta. Minus-green (No. 12 is minus-blue, No. 44A is minus-red)
34A                         Violet. For minus-green and plus-blue separation.
38A                         Blue. Absorbs red, some UV and green light.
44                           Light blue-green. Minus-red filter with much UV absorption.
44A                         Light blue-green. Minus-red (No. 12 is minus-blue, and No. 32 is minus-green)
47A                         Light blue. Exciting fluorescein dyes in medical applications.
47B                         Deep blue tri-color. Color separation and tricolor work.
61                           Deep green tricolor. Tricolor work with Nos. 29 and 47.
92                           Red. Color densitometry
98                           Blue. Equivalent to No. 47B plus No. 2B filter.
102                         Yellow-green. Converts barrier-layer photocell response to eye luminosity response.
106                         Amber. Converts an S-4 type photocell response to the eye-luminosity response.