Epsom Salt (Magnesium Sulfate) foot bath, stays hot as long as you want…
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Hi ya @rolf
Just as I learn about sous vide maceration of strawberries, I see you using magnesium sulfate to prevent skin maceration due to prolonged water exposure.
Apropos nothing; skin maceration was first described by Jean-Marie Charcot ( of Charcot-Marie-Tooth muscular dystrophy).
Don’t give my wife ideas Rolf 
(& if that was any of our last few ginger toms they’d have been in the water with you)
What a wonderful idea.
at a precise temperature!