Most jewelry investment is proprietary mixes, but they have a bit of plaster of paris in there, along with other stuff that vitrifies during the burnout: they need burnouts of above 1200C. Since people use the term vitrify, I presume that means there's sand and lime in there.
![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png)
timeasmymeasure
no subject
Date: 2018-07-09 04:51 am (UTC)