Osmium tetroxide (OsO4) is a very volatile liquid and is used under the name of osmic acid as a stain for sections in microscopy.
That particular kind of fat does not stain with osmic acid in the usual way.
The embryo was hardened in a mixture of chromic acid and osmic acid.
Greasy finger-marks may also be acted on chemically, so as to bring out details by the application of osmic acid.
The metal osmium, if exposed to the flame of oxidation, fuses and is finally dissipated as osmic acid.
These ciliated furrows stain deeply with osmic acid, and nervous impulses are certainly transmitted along them.
Nucleus of the yolk in connection with the protoplasmic network hardened in osmic acid.
Staining with osmic acid or Sudan (p. 109) will remove any doubt as to their nature.
These granules are more distinct in chromic acid specimens than in those hardened in osmic acid, but are to be seen in both.
This is an especially marked feature of preparations made with osmic acid.
osmic acid os·mic acid (ŏz'mĭk)
A crystalline oxide of osmium that is a volatile caustic and strong oxidizing agent, the aqueous solution of which is used as a stain for fat and myelin and as a general fixative for electron microscopy.