Thought I'd share. This was my first attempt at a feather pattern. I etched in Ferric Chloride and put it together. I wasn't happy with the look so I thought I'd try a coffee etch. Well, as you can see the difference is quite contrasting.
So, the pro's: The coffee etch has a lot of contrast and can look amazing. It makes photography better due to the contrast.
The cons: The coffee etch finish is delicate and rubs off pretty easy.
I'd suggest a deep etch with FC before coffee to help hold the etch longer.
Rule #10; "I can make that" translates to; "I'm to cheap to buy it new."