Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A leuco dye is a dye whose molecules can acquire two forms, one of which is colorless. For example, the spiro form of an oxazine is a colorless leuco dye; the conjugated system of the oxazine and another aromatic part of the molecule is separated by an sp3-hybridized "spiro" carbon.

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