https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13970111Edit ImageSaveSaveEditCropCustom TextOptics: colour scales for violet and yellow. Colour mezzotint [] by R.H. Digeon, ca. 1868, after J. Silbermann.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 780 x 1200 px | 300 dpiLarge JPEG 2138 x 3290 px | 300 dpiFree DownloadOptics: colour scales for violet and yellow. Colour mezzotint [] by R.H. Digeon, ca. 1868, after J. Silbermann.More