Home made PCB:ferric chloride concentration

[Munib]

concentration of ferric chloride for pcb

I want to use ferric chloriode as an etchent for a home made PCB
Can some one plz tell me what should be the concentration of the solution
i mean weight of ferric chloride in grams and the volume of water in liters

I have ferric chloride in powder form

 

[IanP]

The stuff that you by in hobby shops has 42% of FeCl3 and 58% of water ..
So you can use 420g of ferric chloride and 580g (580ml) of water ..

 

[twinsen]

Since you have the powder go ahead...but next time try the Hydrochloric Acid and Hydrogen Peroxide mix....its much cleaner and doesnt corrode everything in sight.
I can't remember the mix though...maybe someone can assist? I think it used to be on the instructions of a Positiv 20 can...