Abstract
Otherwise light‐fast solutions of Rhodamine B (C.I. 45170) in water are found to undergo irreversible fading when acetone is added, both in degassed and in aerated solutions, when the incident light is absorbed by acetone. Addition of acetone increases the concentration of the colourless lactonic form of the dye, and the experimentally determined rate constant decreases with increase in acetone concentration when this is above 50% by volume. At all but the lowest concentrations of dye, an induction period is observed which is considerably increased by the addition of oxygen; this is attributed to the photochemical accumulation of a species from which the semi‐reduced dye radical can abstract a hydrogen atom to produce the leuco dye, and to the photochemical consumption of oxygen, which quenches the triplet states of acetone and of Rhodamine B which take part in the energy‐transfer process.
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