Hello everyone: I am not sure what is going on with my candles and not sure what to call it, perhaps shrinkage? This happens when the candle cools, it seems to have a ring of wax on top. This is before the candle is even burned. Any help would be greatly appreciated, tried to research it, but not even sure what it's called, so I am hitting a brick wall. TIA :-) Wax: IGI 6006 Heating: to 185 Add FO: 175 Pouring temp: 160 Cooled in preheated tumblers in oven. Tumbler Link: http://www.lonestarcandlesupply.com/products/candlecontainers_libbey-tumbler-universal-8.25oz.html This is happening with and without fragrance and color. Sorry if the pics are too big, not sure how to adjust on here. Thanks again for looking