Homebrew PCBs

ed.slatt wrote:
> 
> 
> Hello Group,
> 
> I use Tinnit to tin plate my boards after etching. Tinnit is an
> electroless tin-plating solution. The packaging indicates that it
> contains acidic tin salts and no cyanide or other highly poisonous
> materials. I've tried to contact the producer
> (http://www.philmore-datak.com/ <http://www.philmore-datak.com/>) for 
> information regarding disposal
> but I was unsuccessful. Any disposal tips for Tinnit would be greatly
> appreciated.

Electroless tin solutions will typically contain large amounts of 
thiourea as the most hazardous ingredient. Inorganic tin is relatively 
harmless. For small amounts, 500 mL, you could safely dump this on some 
grass and let oxygen and bacteria do the rest. It will also have small 
acid concentration (1%) such as HCl or H2SO4.

Adam