Hello,
As you probably know, when you etch copper PCBs you use a dark brown liquid called Ferric Chloride. Ferric Chloride can also be a yellowish powder. It eats up copper allowing you to create tracks on a PCB. A very similar chemical, Ferrous Chloride, is a blue-green powder.
Is it possible to convert Ferric Chloride (Etchant), which is available from every Radioshack, to Ferrous Chloride. The difference between the two is just their oxidation states (Wikipedia)
I would really appreciate some help.
Thanks
George L.