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Yes, I whip up the lather in the scuttle.
If you prefer cold water shaves, then fill it with cold water, it will keep the lather tempered in that direction too:)

I have the L version of that scuttle.
I have used it every single day since it arrived some 18 months ago.
It keeps my lather nice and warm, and it is big enough to hold enough lather for 6 passes(...