Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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21/00
Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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G01N21/75
Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
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G01N21/77
by observing the effect on a chemical indicator
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G01N21/78
producing a change of colour
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