A diffraction grating [in the chocolate surface] is an optical component with a periodic structure that splits and diffracts light into several beams traveling in different directions. The emerging coloration [rainbow] is a form of structural coloration. These gratings generally have ridges or rulings on their surface rather than dark lines.
A diffraction grating [in the chocolate surface] is an optical component with a periodic structure that splits and diffracts light into several beams traveling in different directions. The emerging coloration [rainbow] is a form of structural coloration. These gratings generally have ridges or rulings on their surface rather than dark lines.