We used to make sherbet with citric & tartaric acid and icing sugar! Thanks for the link.
I moved on from the link to another within the forum, here andiesenji, and am wondering what is meant by Salt Skip Baking Powder?
I have no idea. It is obviously an Australian product. There are some sodium free baking powders available in the US - Hain Featherweight, which I use, is one; Ener-G is another - harder to find. I assume the Salt Skip is similar.
Ener-G also markets a sodium-free baking soda substitute, for people who have to severely limit their sodium intake:
"Free of: gluten, wheat, casein, dairy, egg, corn, soy, yeast, nut, rice, potato, sodium, low protein, aluminum
Designed specifically for individuals on Kidney Dialysis who must avoid sodium bicarbonate, potassium bicarbonate, and who require higher intakes of calcium. Ener-G Baking Soda is free of sodium, potassium, aluminum and is high in calcium. "
Twice the amount of baking soda is needed to achieve the same effect.
If you scroll to the bottom of that page and click on "Return to low sodium products" you will get a page full of products. Scroll down near the bottom of the page and you will see a jar of the Salt-Skip baking powder on the left and Gluten-Free baking powder on the right.