http://www.p-m-services.co.uk/pcb_etch.htmplease read at the very bottom.
This is not the page i remember, as it doesn't say much about fecl
regenerating.
But the interesting thing it they use lead or graphite anodes.
the sulphuric acid is in my opinion the choice if one wants to make tin
masked pcbs.
st
if you please also have a look at
http://www.proplate.com/tin-plating.htmmostly to read this sentence:
"Tin and its salts are reported to be non-toxic and non-carcinogenic and
are approved for food container and food contact applications. "
So i guess I was right that tin electroplating is much safer than tin
electroLESS plating.