Rubbing alcohol on a paper towel will remove the black soot from a jar candle. By wiseinhimmer
Jar Candle Tips and Tricks
Removing Soot
Refurbishing Old Candles
Cleaning Burnt Food on Glass Cookware
Cleaning Soot From Bricks
Removing Soot from Walls and Ceiling
Removing Labels from Glass Jars
Removing Black Soot from a Wood Stove Window