Hi Everyone,   I'm new to the prepping world and have a couple of questions that hopefully you can help me with. I have a number of Pennsylvanian aged plant imprints that I found and I am wondering if there is any prep work that needs to be done to keep them in pristine condition. As of now I have not done anything to them. These fossils are on dark gray slabs of shale and are a bit hard to see without proper lighting.   Questions:   1.) Is there a way to highlight