Buttermilk pancake mix is green? I like making buttermilk pancakes but usually the batter is too much for one day, after I put the mix in the refrigerator, the mix was a greenish color the next day. Does anyone know if this means it went bad or is this just a characteristic of buttermilk?
Mold doesn't grow that fast in a refrigerator overnight. I'd bet some ingredient reacted with your baking powder or baking soda. I've seen something similar before in three separate circumstances:


instant oatmeal that turned blue when mixed with iodine-treated water (day after day on a camping trip);
garlic mixed with yogurt turns blue when heated;
blueberry pancake batter turned green overnight.