| The winner this Translation of the week is Please be bold and help to translation this article!  A leuco dye is a dye which can switch between two chemical forms; one of which is colorless. Reversible transformations can be caused by heat, light or pH; resulting in examples of thermochromism, photochromism and halochromism respectively. Leuco dyes form the basis of thermal printer papers and certain pH indicators. (Please update the interwiki links on Wikidata of your language version of the article after each week's translation is finished so that all languages are linked to each other.)
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