Johan Ditlev Frederiksen, The Story of Milk
“ Cooling Essential.—If buttermilk is left to stand for hours in a warm room, fermentation goes on and may soon spoil the buttermilk by making it sloppy or bitter. It should therefore be cooled at once when drawn from the churn; if kept in ice water it may remain in fine flavor for several days. Well taken care of it is not only a pleasing and refreshing drink but eminently healthful. In cooking, too, it can be used to advantage.Commercial Buttermilk or Cultured Milk is simply carefully soured milk. It can be made at home from fresh milk either whole or skimmed or partly skimmed. ”
