The synthesis of the active component of commercial Titan yellow for use in the determination of magnesium

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Abstract
The sodium sulphonate groups of the magnesium-reactive component of a commercial Titan yellow are shown to be in the 7-position on each of the benzothiazole rings. Titan yellow synthesised from 2-(p-aminophenyl)-6-methylbenzothiazole-7-sulphonic acid is reliable and sensitive in the determination of magnesium.