Ferric chloride gone into liquid

[ppppenguin]

When I was in my teens in the early 1970s I got fed up with using ferric chloride because it was slow and messy. I tried nitric acid which was readily available from a friendly chemistry lab tech at school. Worked like a dream except when I got it a bit too strong. Put the PCB in the tray and the cloud of brown acrid fumes was, shall we say, unpleasant.