I use basic olde Speedball products: Diazo Photo Emulsion (must activate to make light sensitve with Diazo Sensitizer which is sold in addition to emulsion) and Diazo Photo Emulsion Remover. I buy these products at a little art store in Bushwick- Artist & Craftman Supply. They have almost all you need to set up your own little shop. Blick Art Supply is also great.