A short and dubious description I've read on a magazine article decades ago claimed that these have a temperature profile to go between heating and cooling for

A short and dubious description I've read on a magazine article decades ago claimed that these have a temperature profile to go between heating and cooling for desired effects over time, by the tone in scale of weeks to months. I don't know how or what they do with Kimchi in Korea but there are probably lots of obviouses around it that needs context to realize.