I found a really nice article authored by Matt Droves today. It discusses the positive qualities of making scented soy candles, a mini history on the background of soy candle wax, he even discussed melting temperatures of the soy candle wax to preserve the white color of the soy wax, which I commend him for. He then goes on to discuss the additional of scents.
You might find this article an interesting read. To see the rest of the article click here.