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By H. G. Hadley, T. M. Whitin

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As the temperature rises, the impacts between the atoms and molecules in the substance become of sufficient intensity to cause the emission of electromagnetic radiation from its surfaces. These radiations increase in strength and spread to shorter and shorter wavelengths the hotter the body becomes. When an electric current is passed through a metal wire, the metal becomes slightly warm, and at that stage is emitting infra-red rays but no light waves, and the wire remains dark, but as the electric current increases and the metal gets warmer, it begins to glow a dull red, because it is emitting light from the long-wave, or red, end of the spectrum.

Because of Maxwell's discoveries, light became recognised as an electromagnetic phenomenon, and on his work, and on the earlier discoveries on the properties of electricity by the English scientist Michael Faraday, a whole new field of development based on the concept of matter as an electrical phenomenon has been expanded by Planck, Bohr, Kelvin and Einstein. This formidable body of experience and data has been exploited for the scientific development of colorimetry in the twentieth century by the famous colour scientists of today, including Wright, Evans, Judd, Nickerson and others, to whom so much is due for Colour and Light 37 the acceptance of colour measurement as an essential tool for scientific research and application.

Alum, blue vitriol, and iron, brass and tin were also used. Wood-chips, bark, roots, leaves, nuts and flowers were used as dyes. The most successful dyes were in the yellow range of hues. Blues and reds had to be imported, mostly madder and indigo. Green was made by top-dyeing indigo or Iogwood with a native yellow dye. Although the dyeing industry is now a sophisticated part of huge chemical industries with an enormous output and world-wide distribution, a cottage industry still survives in many parts of the world, partly as an economic necessity in poorer areas and partly, in sophisticated societies, in reaction to commercial technology on a vast scale, and the growing need for leisure activities.

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