If you are going to use the ferric chloride on the plates, you also need a resist like a hard or soft ground to block out parts. It's available at Dick Blick online or some other good art store. I heard rumors that Sharpies and paint pens work too. But copper plates are so expensive, I've been wary of ruining one. But if you want to try it, let me know. Also, make sure you do it in a plastic tub, not metal. And agitate it every so often so the bubbles don't ruin the precision of the image. A lot of processes fall under the term intaglio, like drypoint, aquatint, engraving... Oh, and remember if you are printing the plates on paper, everything appears backwards.