There is a sign of snuff in the candle core.

Insufficient burning of candle flowers, poor air circulation and so on.

1, insufficient burning of candle flower: insufficient burning of candle flower can also lead to the appearance of candle flower. This is because the wick is too thin or the candle flower is too long, or there is too much or too little wax in the candle flower. You can try to replace the wick or adjust the length of the candle flower to ensure that the candle flower can burn fully.

2. Poor air circulation: Poor air circulation around candle flowers will also lead to the appearance of candle flowers. This is the improper placement of the candle flower, or the candle flower is blocked by other objects. You can try to place the candle flowers in a well-ventilated place, or remove other items to ensure air circulation.