I asked some time ago about chemicals for etching I was using nitric
before and many folk recommended Ferric chloride and ferric nitrate
instead. I saved all the replies to use when I was feeling brave,
then just when I need the the hard drive on my computer
The ferric chloride I bought is already a solution ay 50% and the
ferric nitrate is in crystal form at 98%. I have no idea of the
quantities of water to mix with them
I would be really grateful for any advice.