Lab Bites">Lab Bites

After pipetting volatile liquids (like β-mercaptoethano), some of the liquid will vaporise when it is in your pipette tip.  This could enter the pipette itself when you release the pipette's dispensing button.  So try to use a filter tip to stop this from happening.

Otherwise, make sure you eject the tip from the pipette right after dispensing the liquid from it - don't release the button from the "second stop" or it could suck up the vaporised liquid into the pipette itself.