I made a test pattern to determine what my etching capabilities actually are:
![Test Pattern](http://farm4.static.flickr.com/3383/3576583291_8f46f098a7_m.jpg)
(
PDF)
This one is a bit better than my
last one. It's smaller (2x2 inches vs. 5x4 inches) so you don't waste as much board, has test points, and a bunch more common surface mount components.
(results inside)
My method was:
* Print to magazine paper.
* Transfer to copper using 12 trips through the laminator.
* Etch in a muriatic acid / hydrogen peroxide bath.
* Remove toner with acetone.
Here's the final result:
Board 1:
![Etched Board #1](http://farm3.static.flickr.com/2450/3579108318_c884fda47e.jpg)
The 8 mil trace is good!
Board 2:
![Etched Board #2](http://farm4.static.flickr.com/3592/3579107328_4c5d40632e.jpg)
Only the 10 mil trace and higher are good.