The PLOTS Spectrometer is a tool we've been developing at RISD's Environmental Justice research group with student Colin Frazer. It consists of a cardboard box, a broken CD, and a digital camera. We're hoping to use it to identify contaminants and produce hyperspectral scans.
We've created an online analysis tool to upload your spectrometer photos for interpretation. All of this is very prototoype-stage, and we haven't yet identified a material based on the spectra it generates.