I was just on my way to the darkroom and thought of this...

A few questions on Pyrocat-HD:

At 1:1:100, the total concentration of pyrocatechol will be 0.05g/liter, plus 0.0002g Phenidone. This is less than a fifth of the lowest concentration in any other developer formula?

On unblinkingeye it is said that 100ml water plus 100g Potassium carbonate makes a 100% solution, which is clearly rubbish. Things like this tends to make me sceptical...

I don't have K2CO3 at the moment, so will have to use the Sodium equivalent. Will this make a significant difference? I intend to add the Na2CO3 to the water, and not bother with a stock solution B.