Licence: Public Domain Mark
Credit: The process of gold and silver refining. Engraving, 1747. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0023529/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: The process of gold and silver refining. Engraving, 1747. Wellcome Collection. Source: Wellcome Collection.