How do you test liquid or solid samples with your [DIY Spectrometer](/wiki/spectrometer)?

###Sample containers

A good sample container has flat sides, so you can shine lights (and lasers) through it without lots of reflections. It's also good to have the light travel through a consistent amount of the sample -- many cuvettes (traditional spectrometry sample containers) are 1cm x 1cm, so the light always goes through 1cm of the sample.

###Water samples

###Oil samples