Ranger's foil is adhered with glue, not with heat. You can read about it here:
Ranger Shiny Foil Transfer Sheets | Ranger Ink and Innovative Craft Products.
Personally, I won't run any foil through my Minc unless the foil is specifically designed to be applied with heat (i.e. toner or heat-reactive foil).
You can do a google search for 'toner reactive foil' or 'heat reactive foil' and then check out the suppliers in the search results to see if any of them have brown colored foil.
Even if they don't carrier brown, maybe they can point you to a company that does.
HTH.