As a candle expert with years of experience in the industry, I've encountered various scenarios that could lead to a candle emitting black smoke. Black smoke from a candle is generally an indication of incomplete combustion, which can be caused by several factors. Let's delve into the possible reasons and solutions.

Firstly, the wick plays a crucial role in how a candle burns. If the wick is too long, it can draw up more wax than it can effectively burn, resulting in a sooty flame and black smoke. The ideal wick length is typically no longer than 5mm. Trimming the wick to this length before lighting the candle can help ensure a cleaner burn.

Secondly, the type of wax used can also affect the quality of the burn. Some waxes, particularly those with a higher melting point, may not burn as efficiently, leading to black smoke. High-quality wax formulations are designed to burn cleaner and produce less smoke.

Thirdly, the amount of fragrance or essential oil in the candle can be a factor. If there's too much fragrance, it can overwhelm the wax and cause incomplete combustion, which results in black smoke. Manufacturers usually have a specific ratio of wax to fragrance that they adhere to for optimal burning.

Fourthly, the burn time is important. A candle that is not given enough time to burn down the center can lead to a 'tunnel' effect, where the wax near the wick burns faster than the rest, causing the wick to eventually drown in the melted wax. To prevent this, allow the candle to burn long enough to create a melt pool that reaches the edges of the candle. This usually means burning the candle for at least one hour for every inch in diameter.

Fifthly, the environment in which the candle is burned can influence the burn quality. Drafty areas or strong air currents can disrupt the flame, causing it to flicker and produce more smoke. Burning candles in a calm, sheltered area can help maintain a steady flame.

Lastly, the candle's design can also be a factor. Some candles, especially those with complex shapes or multiple wicks, may not burn as evenly as simpler designs. The design of the candle can affect how the heat is distributed and how the wax melts.

To ensure your candle burns cleanly and without black smoke, follow these guidelines:

1. Trim the wick to 5mm before lighting.
2. Use high-quality wax that is designed for clean burning.
3. Ensure the candle has the correct balance of wax to fragrance.
4. Allow the candle to burn long enough to create an even melt pool.
5. Burn candles in a sheltered area, away from drafts.
6. Choose candles with simple designs that promote even burning.

By addressing these factors, you can enjoy a cleaner, more efficient burn from your candles, reducing the occurrence of black smoke and enhancing the overall candle experience.

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If the candle is burning black smoke: either the wick is too long, or there is too much essential oil and the top and centre of the candle. Ensure the wick is no longer than 5mm. ... To make candles burn down the middle, leaving a wax shell: burn candle almost to the edge, then blow out and leave to reset.read more >>