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What is a chromogen?

What is a chromogen? Here are some definitions.

Noun
  1. (chemistry) Any substance that lacks colour, but can be converted into a pigment or dye.
  2. (biology) A strongly pigmented organelle or organism.
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Examples
The extract from the heartwood is not a dye until it undergoes oxidation into hematein, which is an acid chromogen.
The chromogen or pigmentary bacteria have occasionally been the means of working miracles.
Urobilinogen reacts with a chromogen to form an azo dye which appears as various shades of pink or purple.
A positive reaction is indicated if there is a colour reaction on the addition of chromogen and substrate.
In other words, an auxochrome in addition to the chromophore group transforms a colorless chromogen into a colored one.
Immunohistochemistry was performed on an automated immunostainer using the antibodies listed in Table 2 with diaminobenzidine as the chromogen.

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