This is our UK based "Ivory" soap microwave experiment. Ivory soap isn't readily available in the UK, but the pure soap in Aldi (4 bars for 89p) works. Other soaps don't, they just melt and burn, due to the way the soap is manufactured. The resulting soap is textured similarly to polystyrene. Microwave one bar for 2mins 50secs in an 800w microwave!