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
>
>
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