Red: Ruled by Mars. Pure, unadulterated energy; sexual prowess; used for love magick. Great for weight loss and creating energy (motivation). Also, deep devotional love, passion, marriage—Venus governs love but Mars rules Marriage! Choose red when you want to attract a new love or sexual partner, or for absolute seduction. Can be used also for finding that soul/twin mate as well.
Of course common sense says in general DO NOT LEAVE A CANDLE BURNING UNATTENDED IN AN UNSAFE MANNER. SUGGESTION PLACE CANDLE IN A BOWL OF WATER OR SNUFF OUT WHEN LEAVING YOUR HOME.