Gosh Dag it Norm! You had me worried so I put on my parka & gloves and went into my freezing (55 degree) cold garage to check out my plug. After taking it out, it looked nice with a tanish brown color to it. LOL I have about 100 miles on it only.
It's probably b/c I use a mix of 110VP(1 part) and 92(3 parts) octane gas with Castrol 747 oil.