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.
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.