de·stain

[dee-steyn]
verb (used with object) Histology.
to remove stain (from a specimen) to enhance visibility and contrast of parts.

Origin:
1925–30; de- + stain

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
destain

verb
remove stain from (a laboratory specimen) to enhance contrast 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Destain is always a great word to know.
So is bezoar. Does it mean:
a scrap or morsel of food left at a meal.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
Compounds used to wash and destain shell eggs are potential food additives.
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