Homebrew PCBs

If you must use FeCl, don't get the pellets or powder.  Its 
exothermic (I think this is the right term) when it reacts with water 
and produces a lot of heat and splashing if you aren't careful.  
Makes a gawdawful mess.  Nasty stuff.

I agree with Stefan, CuCl is a better way to go (cheap, easy 
availability of components).  Even Ammonium Persulfate is better than 
FeCl (no staining and doesn't generate heat when mixed with water) 
though relatively pricey.