Depends alot upon the material you plan to etch.
John Wright

Search this forum for etching solution or variations of that, there have been many discussions on this topic in the recent past.


edit: here's one... http://aws.org/cgi-bin/mwf/topic_show.pl?id=7233

At our shop, we mig weld 10-10, 10/18 low carbon steel.
for our etch, we use a mixture of 30% nitric acid, 70% methanol.