Homebrew PCBs

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....