21. Transformation between leuco and colored form of crystal violet lactone in response to varying acidity, which is caused by changing temperature 22. Such blocked leuco dyes are the leuco dye precursors that form the leuco dye by a slow, controlled chemical reaction. 23. Such blocked leuco dyes are the leuco dye precursors that form the leuco dye by a slow, controlled chemical reaction. 24. Such blocked leuco dyes are the leuco dye precursors that form the leuco dye by a slow, controlled chemical reaction. 25. Four different types of imaging chemicals are used in thermally sensitive papers : leuco dyes, developers, sensitizers and stabilizers. 26. She died at age 47 from hyperacute haemorrhagic leuco -encephalitis ( not an aneurysm, as is commonly written ). 27. It is also the leuco dye component in some thermochromic dyes, e . g . in the Hypercolor line of clothing. 28. The Arevaci assembled at the town of Numantia which had strong natural defences, and chose Ambo and Leuco as their leaders. 29. Leuco dyes, in general, provide little color when melted unless they are melted in conjunction with one or more organic acids.30. The process, called leuco -depletion, was a precautionary move because white blood cells were seen as a theoretical source of infection.
