I've got a 25Kg sack of Sodium Metasilicate that I have yet to break into - 
I got fed up buying the 50g sachets at an extortionate price so when doing 
some work for a company managed to bag a bag !

Still got to try it but with a bit of luck it will work.

Dom

----- Original Message ----- 
From: "Michael Wirth" <mwirth@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Cc: "Mike Beaver" <mike.beaver@ieee.org>
Sent: Friday, June 11, 2010 2:32 AM
Subject: DIY silicate developer for PCBs


> Mike Harrison quoted Robin Moorshead on his page,
> www.electricstuff.co.uk/pcbs.html (how to make PCBs) on how to make
> your own silicate developer using water glass and sodium hydroxide
> crystals.  Anybody know if the addition of sodium nitrate to the NaOH
> crystals will screw things up?  When I buy NaOH from my "favorite"
> chemical supplier (Walmart, in the plumbing area, as a random brand of
> drain cleaner) it comes with some sodium nitrate.  Anybody know if
> this "contaminant" will screw up the developer?
>
> (I'll just give it a try anyway :-)
>
> Mike
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