Homebrew PCBs

Dried water glass will dissolve in water, but very slowly. I'm not sure how 
fast dried water glass it will dissolve in acid. I know they make silica 
gel crystals by mixing a solution of water glass and sulfuric acid to form 
colloidal  SiO2, then its dried somehow.
I guess your best bet is to try it with dilute HCl, that's assuming some 
water glass is no too difficult to get hold of.

pebo festus wrote:

> --- In Homebrew_PCBs@yahoogroups.com, Adam Seychell 
> <adam_seychell@y...> wrote:
>  
> 
>>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.
> 
> 
> adam are you telling me that even if the water glass is set and hard 
> the acids wiil desolve it?. i have been advised that gycol and water 
> glass will also harden if mixed, will the acids soften this combo 
> also?.
> 
> i was toying with the idea of coating the pcb with water glass and 
> print with glycol. or maybe the other way around, coating with gylcol 
> and printing with water glass. there just has to be a better way.
> mebo
> 
> 
> Be sure to visit the group home and check for new Bookmarks and files:
> http://groups.yahoo.com/group/Homebrew_PCBs 
> 
> Yahoo! Groups Links
> 
> To visit your group on the web, go to:
>  http://groups.yahoo.com/group/Homebrew_PCBs/
> 
> To unsubscribe from this group, send an email to:
>  Homebrew_PCBs-unsubscribe@yahoogroups.com
> 
> Your use of Yahoo! Groups is subject to:
>  http://docs.yahoo.com/info/terms/ 
> 
>