The usefulness of this reagent in quantitative determination is the formation of a red colouration ( peaking at 580 nm wavelength ) when chromotropic acid in 75 % sulfuric acid reacts with formaldehyde.
2.
Members of this species have been observed to exhibit aversion to large areas of conspicuous color on and near human observers ( negative chromotropic responses ), including white, red, orange, and blue.
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