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==Safety considerations== [[File:Label for ampoules of OsO4.jpg|thumb|right|300px|Label with poison warning]] OsO<sub>4</sub> will irreversibly stain the human [[cornea]], which can lead to blindness. The permissible exposure limit for osmium(VIII) oxide (8 hour time-weighted average) is 2 ΞΌg/m<sup>3</sup>.<ref name=niosh>{{ cite web | url = https://www.cdc.gov/niosh/idlh/20816120.html | title = Osmium tetroxide (as Os) | work = Documentation for Immediately Dangerous to Life or Health Concentrations (IDLHs)| date = 2 November 2018 | publisher = Centers for Disease Control }}</ref> Osmium(VIII) oxide can penetrate plastics and food packaging, and therefore must be stored in glass under refrigeration.<ref name=stain/>
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