Jan 06, 2016 About that rusted finish Before we ship your Box, we treat it with a vinegar mix that starts the rusting process. When you burn it for the first few burns, the steel continues to react and "cure". Sometimes it will show a bright orange rust on the back, and to a lesser degree on the front and top. Be assured that with a little time and exposure, the whole box will mature to a dark brown, consistent and "hard" finish. The more it gets exposed to the elements, the quicker it will mature.