https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13957425Edit 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 994 px | 300 dpiLarge JPEG 1874 x 1553 px | 300 dpiFree DownloadA cauldron of boiling mud on a sulphur mountain, Iceland. Coloured aquatint by J. Clark, 1811, after Sir George Mackenzie.More