A range of dyes has been synthesised by condensing highly electronegative active methylene compounds derived from indane‐1, 3‐dione with the formyl group of substituted benzaldehydes. The visible absorption spectroscopic properties of the dyes were investigated. In general the dyes provided bright colours, ranging from yellow to blue on synthetic fibres when applied by vapour‐phase transfer printing, the prints having reasonable fastness to washing (ISO 3).
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