DIY portable spectrometer

https://www.electronics-lab.com/diy-portable-spectrometer/

Spectral signature is a characteristic property of a material that represent how the matter interacts with an electromagnetic radiation at different wavelengths. By looking at the reflectance spectra of a material, scientists can not only retrieve vital information like the chemical composition and crystal structure of the material, but also the presence of any impurities or third element within it. […]