Hi Karen, I don't think a bluish tinge is too worrisome, but you may want to give your starter a day or two of twice a day feedings at room temperature to see if the color persists, or if it returns to its normal appearance and behavior. Feeding at room temperature is what builds the populations of wild yeast and friendly bacteria, so if your starter spends most of its time in the refrigerator it will likely benefit from the opportunity to ferment at warmer temperatures through a few feeding cycles. I would also be sure that when you plan to return your starter to the refrigerator that you give it a few hours at room temperature (so that it begins to bubble) after a feeding and before refrigeration. I hope this helps! Let us know how it goes. 

Barb

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