Quote Originally Posted by black View Post
Thank you for this clear explanation JDP.

Tips like this can be so helpful in our lab work and can save a lot of time
and money.

Have you worked with butter of antimony ?
Yes.

Also, in order to clean the glassware used for experiments with such metallic/semi-metallic "butters", you will also need diluted solutions of hydrochloric acid. These substances hydrolyze with water, so, if you try to clean the glassware with plain water first they will form annoying white precipitates of oxychlorides. So, first they need to be rinsed with dilute hydrochloric acid solution two or three times, which gets rid of practically all the residues of these "butters". Then the glassware can be cleaned with regular water, as usual.