https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13959241Edit ImageSaveSaveEditCropCustom TextOptics: crystals exhibiting interference colours. 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 800 x 1200 px | 300 dpiLarge JPEG 1318 x 1977 px | 300 dpiFree DownloadOptics: crystals exhibiting interference colours. Colour mezzotint by R.H. Digeon, ca. 1868, after J. Silbermann.More