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Answer for the clue "Measuring the optical density of a substance by shining light on it and measuring its transmission ", 12 letters:
densitometry

Word definitions for densitometry in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
densitometry \densitometry\ n. measuring the optical density of a substance by shining light through it and measuring the intensity of the transmitted light.

Wikipedia Word definitions in Wikipedia
Densitometry is the quantitative measurement of optical density in light-sensitive materials, such as photographic paper or photographic film, due to exposure to light. Optical density is a result of the darkness of a developed picture and can be expressed ...

WordNet Word definitions in WordNet
n. measuring the optical density of a substance by shining light on it and measuring its transmission

Wiktionary Word definitions in Wiktionary
n. 1 The measurement of optical density by use of a densitometer 2 The measurement of body density