I always knew this but somehow never got around to trying it, probably because I like copper so much I always have a lot of it around. Then I found a good sized sheet of brass in my metal stockpile, so I decided to give it a try. It works exactly the same as etching copper- I just apply my resist and hang it design side down in the etching bath. I got a nice deep etch. Now I'll have to experiment with different patinas for brass, since liver of sulfur doesn't work on brass. I think it looks nice without a patina, but it might be fun to try a few different effects to bring out the pattern more.