Here is a thought for testing. Either IR (Infra Red) or NMR (Nuclear Magnetic Resonance) will do the trick. If a local school has either unit, a simple 10 minute test on either will reveal the nature (and possible purity including contaminants) of your material. I can't hurt to ask someone.
There are huge textbooks of spectra out there that will also help.
There are open databases of organic spectral data online now. I found even CD-3 and CD-4. You can also now do this with your android phone with an attachment to the camera iirc.