Picked up a new [used] gas stove yesterday, but made the mistake of not removing the ceramic logs before loading it into the truck. When I got home 86 miles later, I discovered they had become dislodged and knocked around a bit. They didn't break, but a couple of them have chipped, leaving less-than-realistic looking white spots. My question: What, if anything, can I use to touch up these white spots on the logs? I was thinking of maybe just good old brown/black/gray magic marker.