One of the best ways to determine if your candle is made with pure all-natural soy wax is by simply looking at the tops and sides (if visible) of your candle. If you notice a white-ish or crystalline color coating, we refer to this as frosting or blooming. Frosting is a completely natural characteristic of soy wax. Frosting does not affect the scent throw or the burning properties of your candle.
To minimize frosting, we try to keep our candles out of direct sunlight and fluorescent lighting, but this can be a challenge in itself and is almost impossible to completely control frosting. Changes in temperature when a candle is being cooled can also cause frosting. So if you see this happening in your candle, take it as a good sign that your candle is made from 100% natural soy wax.
The best soy candles are made from 100% natural soy wax without any synthetic or petroleum derived additives. These additives are not necessary and yet many candle companies blend soy wax into a paraffin wax candle. This is for the benefit of being able to claim 'natural' or 'soy candle' but also to keep the price of the candle competitive. Hence, if you see a soy candle that is very cheap, the chances increase that it will contain paraffin or another synthetic wax.