This question seems to come up all the time. Why do the instructions call for such a concentrated carbonate solution? This always causes problems. Even if it were to all dissolve, if the room temperature should drop then some will crystalize out. Why not make the solution half strength and then instead of mixing it 1:1:100 mix it 1:2:99. The resulting solution is the same. Be aware that potassium salts are often more active than their sodium equivalents The solubility of potassium carbonate anhydrous is 52.8% at 20 C. -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Camclicker@xxxxxxx Sent: Friday, September 16, 2005 2:14 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Mixing I am going to mix up 100 mL of Pyrocat HD and solution B calls for 75g Potassium Carbonate to be mixed with 70 mL distilled water and topped off to 100 mL.. The last time I tried mixing this dense a solution (84g Sodium Carbonate to 100mL water) I ended up with a glob of unusable, moist Sodium Carb. Will the Potassium behave the same way as the Sodium, if so is there a trick to mixing dense solutions? Bruce Brooklyn, NY camclicker@xxxxxxx www.camclicker.com