Forgotten to answer your question. Yes, there are 2 ways to heat up the soap into liquid form, 1st is in the microwave and 2nd is in some heated water...not really boiling but hot enough to melt the soap.@Chard52142
Do you just heat up the soap to a liquid form and then pour it into the glass bowl where it will Harden as it cools down?
It really looks cool with what you have going on there.
I choose the 2nd as I feel I can control better compare to the 1st method...
Remember not all soaps can be melted...Hope this helps