Quote Originally Posted by ongarine View Post
I'm an happy and satisfied user of Pyrocat MC and this suggestion to make a sort of "Pyrogallol MC" is very interesting.
If I understand well you have to mix, for the Pyrogallol formula, the same amount of catechol + 2/3 of the weight for Pyrogallol formula.
At the end for one liter of stock solution, as the original formula for Pyrocat MC called for 100 grams of Catechol, it will be 150 grams of pyrogallol to mix Pyrogallol MC.
Am I right Pat?
No, no! Use 2/3 the weight of pyrogallol in place of the catechol. So, instead of 100 grams of catechol use 67 grams of pyrogallol. Metol and pyrogallol are the only developing agents, not counting the small amount of ascorbic acid.