D wrote:
>
>
> --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, "don2822003" <vk3yv@...> wrote:
> >
> > Hi all, Sodium Carbonate is sold quite cheaply as a swimming pool
> > additive to raise pH in swimming pool water, also known as Soda Ash.
> > The mixture I use is 7 grams to a liter of water. I use it with Riston
> > sensitised board which looks to be the same type of sensitising that
> > has been discussed on this forum lately.
> > Don VK3YV....
>
> It's even easier to get than that. Just go to the grocery and buy
> a box of "washing soda" (usually produced by Arm & Hammer here) [1].
> Also, there's a way you can produce it from baking soda by baking
> it.
Alternatively, take some sodium bicarbonate from your kitchen pantry,
place in a dry cooking pot and heat on the stove >200 deg C, to get your
sodium carbonate anhydrous (i.e. Na2CO3 without the water molecule it
likes to bond too).