Choosing a candle container may seem to be a simple and personal decision based mainly on taste. This is true, but if you consider some additional factors, you can save yourself a lot of time and trouble in making the perfect candle.
When a candle burns, it forms a circular burn pool in the wax. As the candle burns down, the burn pool goes deeper into the candle, so that the shape of the melted wax is a cylinder (like a soda can). Therefore, the easiest container to wick is one shaped like a cylinder (like our apothecary jars.)
Another tip having to do with wicking... In our extensive testing, we've found that wicking a jar over 3-1/2 inches is very difficult with a single wick, especially a candle made with soy wax and a lot of fragrance (our personal favorites!). We recommend 3 inches or less for easy wicking and less soot.
Not all containers can be used safely as candle containers. Many jars are not made to handle the heat created by a burning candle. All of the candle containers at CandleScience are ASTM certified.
Based on our experience, and lots of feedback from our customers, we'd like to offer some recommendations for choosing the right candle container for the job:
The easiest containers for making soy candles are those with opaque (not clear) sides. If/when a soy candle frosts, it is very visible through the sides of a translucent (clear) container, like glassware. This can be okay, especially if the wax has no color in it, but expect to see the frosting on the sides when you use glass containers.