Yep...we always had a lot of fun around the camp fire by throwing flour on it....sparkles, snaps, fizzes and makes the fire into a dazzling little fireworks show! Not something I'd do in the kitchen.
Try rotating your supply and not letting it get so old? We keep ours stored in 1 gallon glass jars, each time we empty one, we refill it and put it in the back of the rest. You might also try putting it in the freezer for a week or so, it may have an affect on the taste.