Abstract
THE ability of colloidal electrolytes to change the colour of oppositely charged dyes is well known. One of the earliest systematic studies was that of Hartley1, and later Harkins and others showed that the colour change could be used to observe micelle formation2. Similar colour changes can sometimes be caused by non-ionic soaps in solutions of ionized dyes of either charge, but a more striking effect is found with some non-ionic soaps and certain xanthene dyes in the undissociated form. Instead of the usual band shift of between 10 and 20 mµ to the red, there is a more or less complete removal of the main absorption band and discharge of visible colour. Discharge also occurs if water-miscible organic solvents are added, or if the dye is dissolved in the pure solvent.
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