Clear PCB Etchant

[Paul Perry]

At 07:50 AM 14/09/99 PDT, david leigh wrote:
 ammonium persulphate. 

>To keep the stuff hot, the cheapest way is to go and buy a old electric 
>frypan from the op-shop or wherever and use this to keep the acid cooking.
>
.....if that frypan is bare aluminium, I suspect the ammonium persulphate
will dissolve it faster than the board... anyone tried this?

paul perry Melbourne Australia