Hi there..I have also used Soy Sauce for sunburn and for burns from the oven and hot oil. It is excellent. I have since found out that the Japanese are now using a derivative of SoySauce for a Magic Liquid for Burns and skincare. They realise that people working in the Soy Sauce Company working with the fermented soybeans had incredibly younger and smoother hands than all of there other workers.
all the best
Diana Moore - New Zealand