Physics Teacher Volume 45, Number 1, ISSN 0031-921X
Several papers have been published on the use of a CD as a grating for undergraduate laboratories and/or for high school and college class demonstrations. Four years ago "The Physics Teacher" had a spectacular cover picture showing emission spectrum as viewed through a CD with no coating. That picture gave the impetus to develop a system that can project the spectra of light falling on a CD on a white board or a screen. Such an arrangement would be more suitable to show diffraction spectra to a large class.
Ouseph, P.J. (2007). CD Rainbows. Physics Teacher, 45(1), 11-13.