Temperature of Caswell gold solution

[apricotscrub]

I am plating gold, do I need it to be at room temperature or at 140 degrees. The manual says room temperature, the bottle says 140, i've seen other gold plating solutions such as Contenti's at much cheaper, but it has to be shipped hazmat, does that mean there is cyanide in the other ones? Also, where can I find a heater with a thermometer to heat a solution if I use gold that won't get affected or affect the solution when its time to plate. Or should the heater be removed during the heating process and I could just use a fish tank heater?