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The Red Hat Society is a society exclusively for women over the age over 50. They identify themselves by wearing a red hat with a purple/mauve feather.

Scorpionine and DABCO/Br2 are both highly coloured, however neither of them appear to have any utility as a dyestuff.

The calculated value of λmax is not sensitive to many factors including the basis set; the presence or non-presence of the counter ion or solvent. This means the reason for the error in prediction is not yet known.

Alizarin is chemically known as sodium 9,10-dihydro-3,4-dihydroxy-9,10-dioxoanthracene-2-sulponate.

For many years an incorrect structure for mauveine was published in most of textbooks. The methyl group was located in a different position.