Hi, I was wondering if anyone else has had this problem the 4630 wax, is getting a strange black coloring on the top of the wax, I think it is from off the wick, I used to use j-50 but they quit carrying it , not sure why this is happening. I know someone else said they blended their 4630, any ideas where to start with a blend, in all the years I have done this have never had this problem. Wicks are htp104's. Thanks in advance for any help. Valerie