I just started candle making about 2 months ago. I bought the IGI 4627 and really like the cold and hot throw. but every time I burn my test candles the wax melt pool turns an ugly brown color. I use eco wicks,one dye chip and 10%-12% fragrance oil per pound. Am I doing something wrong? or is there a way to reduce or eliminate this problem. Any advice would be much appreciated.