Brown: Ruled by and sacred to Mother Earth. A stabilizer and grounder, for serious work or employment. Forces action where there is none. Also blessing and thanks for all material/earthly things. Use in a money drawing ritual to encourage and stabilize continuing monetary income.
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.