Sorry to change the topic without changing the header, but to get back onto homemade foundations :-D, i have made blank sheets, cut them in strips and used as starts in frames. Some are pretty soft, easy to handle; others -same room temperature, same wax batch actually- are more brittle, shatter some when cut so i have to be gentle (which i do not know how to be). i read to add a little propolis to strengthen the wax. Does one need to grind it or leave it in chunks?
Any input on why it became brittle (cooling to slow? to fast? temp of melted wax to high? What's the prognosis doctor?) or how to solve the problem?