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It's easier to control the water if you generate the lather in a different bowl than you keep the soap in. Learned this back when I was playing with Williams, and kept it up when I switched to...

Never used the Burma Shave soap, but Glycerine soaps dissolve quite quickly, even more so if they're soaked like you describe. Hard soaps (Williams, Harris, Truefitt&Hill) can handle soaking much...