Interested in Spectral Challenge? Not sure how to get started? Browse these steps, then pick and choose a sequence that works for you and your community!

###Figuring out what you are interested in###
Think about what environmental contaminants are of concern to you. For instance, lead, crude oil, PAH - polyaromatic hydrocarbons, e. coli bacteria, and many others.

Consider whether these contaminants are elements, molecules, biological, other? A rule of thumb is that the simpler the chemical structure, the simpler the spectrum. 

###Collecting known reference samples###
Think about where you could get a sample of these contaminants. 

* For instance, if you are worried about fertilizer runoff from nearby farms, consider going to a farm supply store and buying a small quantity of common fertilizer. 
* Another example, if you are worried about fuel from a local waterfront fuel depot spilling into your waterways, you could go to the depot and ask the staff for a small sample. 

Get ahold of a clean glass container, perhaps even order sterile glass container to avoid soap residue. One with flat sides and bottom will make it easier to shine light through.