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<p>[QUOTE=&quot;desertgem, post: 2292806, member: 15199&quot;]I would seal them in acrylic as they are an extreme oxidizer when made dust size, such as from scratching or rubbing, resulting osmium tetroxide is very toxic. Back in the 60&#039;s I used it in Electron microscopy as a &quot;radiological stain&quot; due to its density. No one knew how scary it might be until damage became apparent due to blindness or kidney failure in researchers who had used it long term.[/QUOTE]</p><p><br /></p>

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