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Don't attempt to melt or microwave hard/milled or tallow soaps - you will bake them and they will die. And stink. He's talking about glycerine soaps here, like Col. Conk. If in doubt, just grate.
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I'd suggest it take longer than 3-5 seconds to load a brush up, having about 6 soaps in regular use myself. Even Tabac, which is very easy to load and lather takes more than a few swirls, and new...