Quote Originally Posted by Jarvman View Post
Yeah I'm a bit gutted that I've got the citrate now instead of the oxalate. I phoned up B&S but the price for shipping one bottle is rediculous. :-( Is there any where in this country I can source it? Should have bought some off Paul and Max when I was up there. They are working on an exhibition in Italy soon showcasing 21 years of their work at the mo.
Jarvman it's easy to make your own PO from potassium carbonate and oxalic acid if you can get those chemicals locally.

(You may want to do this outside or at least with good ventilation as the process gives off CO2, some heat and a significant amount of bubbles. Think gradeschool volcano project.)

To make 2 Liters:

1. Start with about 1100 ml cold distilled water in a container big enough to handle all the effervesence - maybe a gallon or two.

2. Add 450 grams of Potassium Carbonate mono with stirring until dissolved.

3. SLOWLY add 400 gm of oxalic acid to the potassium carbonate solution with stirring, waiting each time you add the acid until the bubbling subsides. Continue until all of the oxalic acid has been added.

4. Add water to bring total volume to 2 liters. Check the pH at this point. It should be near 7.0 (neutral). Now add more oxalic acid in small amounts and keep checking the pH. When you get the pH to about 6.0, you’re done.