https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13964893Edit ImageSaveSaveEditCropCustom TextThe process of gold and silver refining. Engraving, 1747.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 1090 px | 300 dpiLarge JPEG 2833 x 2573 px | 300 dpiFree DownloadThe process of gold and silver refining. Engraving, 1747.More