The weather here became quite hot lately (in high 80's to 90;s) and somehow my sourdough starter has become a yellowish color. It does not really smell bad. It just smells a bit sharper. I baked a batch of bread and it came out with a sort of pungent taste, more sour than usual. Now i noticed the yellow color. What would be the cause of that? should i throw it out? or perhaps just use a tiny bit to make a new starter?