Osmium powder powdery and dark blue-black.Osmium powder also slowly oxidized at room temperature. It produces osmium tetroxide and has a fishy smell and is highly toxic.
The use of Osmium powder includes its use as an alloying component with other group metals, and the resulting alloy is extremely hard (for example, osmiridium, a naturally occurring Osmium powder and Iridium alloy, very hard and used for the tip of the nib). Osmium powder can also be used as a strong catalyst in gas reactions.
Handling and storage of osmium powder：