There are some wonderful candle making additives now available to the hobbyist market. With the aid of these additive you can adjust the amount of fragrance a wax will hold, the hardness of your wax to prolong burning time, the opacity of your wax to bring your colours alive, or simply as a mould release-aid.
Stearin or Stearic Acid. When blended with paraffin wax, stearin will lower the melt point and, when cooled, will strengthen the crystalline structure helping the candle to hold it's shape - just what you need for pillar candles and other moulded candles. Stearin will also increase the amount of fragrance wax can hold before it 'weeps' or 'pools'.
Probably one of the most popular candle making additives, vybar improves the hardness of candles, without making them brittle. Vybar is another additive that allows a higher percentage of fragrance to be held by the wax. Ideal if you like more strongly fragranced candles. Vybar has a relatively low melting point which means it can be added directly to wax as it melts, without being melted first and then added. Unlike stearin, which will perish a latex mould, vybar is perfectly safe to use in
rubber and latex moulds and acts as a mould release.
Added to wax to increase the amount of scent the wax will hold in suspension. it's low melt-point allows it to be melted along with the wax making it very convenient.
Micro Wax (Soft)
Very popular additive when using rubber moulds as it helps eliminate bubbles. It can be used in place of stearin or vybar as a mould release and has the added advantage of reducing mottling on the candle surface. Micro wax is another good additive for giving strength and rigidity to pillar candles.