https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13967717Edit ImageSaveSaveEditCropCustom TextA cauldron of boiling mud on a sulphur mountain, Iceland. Coloured aquatint by J. Clark, 1811, after Sir George Mackenzie.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 927 px | 300 dpiLarge JPEG 3012 x 2327 px | 300 dpiFree DownloadA cauldron of boiling mud on a sulphur mountain, Iceland. Coloured aquatint by J. Clark, 1811, after Sir George Mackenzie.More