11. The dyes _ known as leuco dyes _ can turn green, violet or blue. 12. Exposure to ultraviolet radiation, solvents and high temperatures reduce the lifespan of leuco dyes. 13. The length of the segment above the threshold temperature for the leuco dye then becomes colored. 14. A leuco dye and a developer, when melted together, are enough to produce color. 15. Organic leuco dyes are available for temperature ranges between about and, in wide range of colors. 16. The Beck's envision using chemical dyes called leuco -crystal violet or leuco-malachite green. 17. The Beck's envision using chemical dyes called leuco-crystal violet or leuco -malachite green. 18. The rate of the deblocked leuco dye oxidation is dependent on the pH of the resin polymer matrix. 19. Bate-smith recommended in 1954 the use of the Forestal solvent for the isolation of leuco -anthocyanins. 20. Bate-smith recommended the use of the Forestal solvent for the isolation of leuco -anthocyanins in 1954.
