Homebrew PCBs

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).