Rainbow, artificial

Who among us does not enjoy the vision of a rainbow The spectral colors spread out across the sky inspire awe and pleasure no matter how many times we see them. For this reason, we have attempted to replicate rainbows artificially. We can go to any toyshop and find rainbow glasses, any rock shop and find rainbow quartz made by plasma ionization techniques. Jewelry and craft shops sell rainbow jewelry made by electroplating titanium or niobium oxide. Teachers use rainbow tubes with a universal indicator to demonstrate pH changes and acid-base reactions. Dye mixtures can be separated by rainbow electrophoresis and rainbow chromatography. Rainbow thermometers and toys are made from liquid crystals. Thermochromic materials can be heated to produce rainbow colors. Every toy shop is awash with rainbow colors, a phenomenon not available prior to the many inventions of the twentieth century [39]. 

Schisler, G. J. and Bergesen, E. P. (1996). Postrelease hooking mortality of rainbow trout caught on scented artificial baits. North American Journal of Fish Management 16, 570-578. 

Faktorovich, K.A. (1958). On the disturbance of fat metabolism in the liver of rainbow trout cultivated using artificial foods (In Russian). In Proceedings of the Conference on Fish Physiology (G.S. Karzhinkin and G.A. Malyukina, eds), pp.237-243. 

A rainbow of synthetic colours appeared. Chemists had cracked the chemical structure of colour. Synthetic alizarin allowed thousands of new colours to be produced. Even the legendary Tyrian purple squeezed from the juice of molluscs was duplicated in German laboratories. Nature gave birth to a parallel world, a second nature - artificial colours, then later textiles, substances, any manner of materials. For Engels, the extraction of alizarin and its synthetic reproduction changed everything ... 

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