Re: shiny side down a myth?
Theoretically, shiny side down would keep the heat in the bowl longer than the dull side down, as it would act as a radiant barrier. Though, this may be on such a small scale that it appears unnoticable to the smoker. Also, to be an effective radiant barrier, the material used should be excellent at reflecting heat and poor at absorbing it. Though, it may be good at reflecting heat, aluminum foil absorbs heat due to being thin and because of a low melting point aluminum is more suseptable to heat, making any insulating benefits of shiny side down unapparent.
The preference of which side goes down is mainly just habitual. I always place the shiny side down for this same reason.
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