Rubbing

What kind of materials do I use to make a rubbing?  What kind of paper? Black Crayon?

Gorgias

The size of the paper depends on the size of the rubbing. You don't want to use sheets of paper taped together.  If the rubbing will be larger than a single sheet of your paper, do rubbings of each section and overlap the rubbings so that you can splice the rubbings together at a later time.  Use what's called tracing paper.  It is thinner than writing paper and you can see through it, sorta.  Another thin paper is called onion paper.  If you can get these in rolls, the better.  Find these papers at art supply stores.  While there, get a supple of thick pieces of charcoal used for sketching portraits, etc.  You can save a little money if you can find some colored chalk at a dollar store.  Dark crayons can be used, but you'll do better with them if you'll remove the paper and lay it on it's side to rub---the same way you'd use the charcoal or chalk.  The good point for chalk is ease of use and clean up, but it might rub off your paper kinda easy, too.  Do some test rubbings with the different materials and see which combinations work best for your purposes.

Good luck and have fun.