One of the "Sand Bath" processes used in dental soldering.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: One of the "Sand Bath" processes used in dental soldering. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: One of the "Sand Bath" processes used in dental soldering. Wellcome Collection. Source: Wellcome Collection.