Optical filter with reversible color change

Details Optical filter with reversible color change Optical filter with reversible color change

1986-02-26

1988-06-21

Prunner, Kathleen J.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

436169, G01N 2178

Patent

active

047524472

ABSTRACT:
The present invention is directed to an optical filter that includes a mixture of at least one basic or acid color former or dye, preferably being a triphenyl methane system and at least one complementary acid or basic compound. The mixture reversibly changes color in response to a gas or vapor. The mixture may be embedded in a matrix substance and/or may be applied to a carrier. The color change may be measured photo-electrically.

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