Candle Burning Signs
Burning bright and clear is generally a positive sign that the work is moving along quickly or (if you involve spirits in your practice) that your spirits are working hard and getting things done.
A glass encased candle that has burned black can mean a lot of negative forces working against you.
A candle that burns cleanly signifies that all is well and the working succeeded.
Popping noises mean that the candle is communicating with the spirits and angels.