Homebrew PCBs

Steve wrote:

> --- In Homebrew_PCBs@yahoogroups.com, "pebo festus" <mebo31@y...> wrote:
> 
>>i was just wondering if any one has tried putting water glass (sodium 
>>silicate) in a printer cartarage, printing the traces, ...
> 
> 
> Yikes! Corrosive, at least it is to flesh.
> 
> http://ptcl.chem.ox.ac.uk/MSDS/SO/sodium_silicate.html
> 
> http://www.infoplease.com/ce6/sci/A0851590.html
> 
> Steve



The sodium silicates are alkaline, so any contact from acidic 
copper etchants will only neutralize and you end up with a 
solution of silica gel (colloidal SiO2) and the salt.