https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13961814Edit ImageSaveSaveEditCropCustom TextOptics: a colour-circle, after M. E. Chevreul. Colour aquatint by R.H. Digeon, ca. 1868.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 787 x 1200 px | 300 dpiLarge JPEG 2150 x 3278 px | 300 dpiFree DownloadOptics: a colour-circle, after M. E. Chevreul. Colour aquatint by R.H. Digeon, ca. 1868.More