phosphotungstic acid stain

phos·pho·tung·stic ac·id stain

the first general stain used for electron microscopy; a selective stain for extracellular components such as elastin, collagen, and basement membrane mucopolysaccharides; it can be followed by uranyl acetate or lead.
Synonym(s): PTA stain
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22) They also stain with Giemsa (figure 2) and Mallory's phosphotungstic acid stain.
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