Optics: interference phenomena, exhibited by diffraction gratings. Coloured mezzotint by M. Rapine [1883], after B. Desgoffe. https://www.rawpixel.com/image/13968649/image-background-pattern-circleFree Image from public domain licensePng hydrated carbon monoxide myoglobin sticker, transparent background https://www.rawpixel.com/image/9059671/png-sticker-lightView licenseHydrated carbon monoxide myoglobin collage element isolated image https://www.rawpixel.com/image/9059672/psd-abstract-blue-collage-elementView licenseDiffraction of electrons on microcrystallitic crystals or powders; platinum. Photograph by J.J. Trillat. https://www.rawpixel.com/image/14021493/photo-image-art-pattern-collageFree Image from public domain licenseDiffraction of electrons on microcrystallitic crystals or powders; beaten gold. Photograph by J.J. Trillat. https://www.rawpixel.com/image/14006055/photo-image-background-art-patternFree Image from public domain licenseHydrated carbon monoxide myoglobin collage element isolated image https://www.rawpixel.com/image/9041552/image-abstract-blue-collage-elementView licenseDiffraction of electrons on microcrystallitic crystals or powders; aluminium. Photograph by J.J. Trillat. https://www.rawpixel.com/image/13996343/photo-image-circle-public-domain-natureFree Image from public domain license