Are you sure that you have potassium carbonate and not sodium carbonate? If you use the right amount of potassium carbonate and water and add the carbonate slowly with stirring it should go into solution easily. If it does not I would suspect something wrong with the chemical.
But yes, you can use other accelerators, including a 10% solution of either sodium hydroxide or potassium hydroxide, but this may give slightly larger grain. You can also mix a 15% sodium carbonate solution and use 5X the amount of B solution. That is, the 1:1:100 dilution becomes 1:5:100.
Originally Posted by Lyn Arnold