ALL THE COLOURS OF THE RAINBOW
... A 1 PHRASE used every day. Yet if you study the rainbow you will find in it only seven colours, the colours of the spectrum violet, indigo, blue, green, yellow, orange and red. The British dyestuffs chemist provides an incomparably greater number. Colour, in the form of dyestuffs, enters into almost everything we wear, use or even eat in the course of our daily lives. The dyestuffs industry ...