| http://www.w3.org/ns/prov#value | - ross-linked by means of radial rays (X rays, gamma rays and electron rays) and energies such as of supersonic waves besides the methodresorting to use of light or heat.The amount of aromatic amine which will be included in a photochromic system of the invention may vary over a very wide range, from an amount which gives a barely perceptible coloration to an amount which gives high intensity colora
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