Homebrew PCBs

In a message dated 2/13/2013 1:54:36 A.M. Eastern Standard Time,  
scubadogct@... writes:

Does the addition of Hydrochloric acid help to maintain its working  
strength also?

From what I have read adding Hydrochloric Acid (muriatic  acid)
does help to rejuvenate the Ferric Chloride. Here is a short
article  on the subject  :

http://users.monash.edu.au/~ralphk/etching-pcb.html

The article  says you can rejuvenate Ferric Chloride by adding a
small wad of steel wool,  then filter out the solution and add some 
Hydrochloric Acid. The steel wool  precipitates the copper
out of the solution. It doesn't say how much steel wool to add
or how much Hydrochloric Acid to add so you will
probably need to do it  by trial and error, but should be worth a try.

73 Todd WD4NGG