Why Do Homemade Candles Sink in the Middle?

When making homemade candles, it is common to encounter issues where the candle sinks in the middle. This phenomenon can be attributed to several factors, including the cooling process, pouring temperature, wick placement, additives, and the type of wax used. Understanding these factors can help you minimize or prevent caving in, ensuring your candles are both attractive and functional.

The Cooling Process

As the candle wax cools, it undergoes a contraction process. If the outer edges of the wax harden more quickly than the center, the middle might sink as a result of this contraction. This effect occurs because the wax is cooling from the outside in, and uneven cooling can disrupt the uniformity of the candle.

Pouring Temperature

The temperature at which you pour the wax is crucial. If the wax is heated too high, it can lead to uneven cooling and, consequently, sinking. Ideally, you should pour the wax at a temperature that allows for even cooling. This is achieved by pouring the wax at a temperature near its melting point, ensuring that it solidifies uniformly.

Wick Placement

The size and placement of the wick play a significant role in the candle's overall stability. If the wick is too large or not properly centered, it can create an uneven burning situation. As the flame melts the wax around the wick, a depression might form in the center, as the melted wax flows away from the wick faster than it can be replaced.

Additives and Fragrances

Some additives or fragrances can affect the consistency and cooling properties of the wax. These substances can cause the wax to behave unpredictably during the cooling process, potentially leading to sinking. It is important to choose additives and fragrances that are compatible with your wax type to maintain the integrity of your candle.

Type of Wax

Different types of wax, such as paraffin, soy, and beeswax, have varying cooling properties. Some waxes may be more prone to sinking than others. For instance, paraffin wax is known to shrink more when it cools, which can lead to sinking. Choosing the right type of wax based on your requirements can help minimize this issue.

Minimizing Sinking: Practical Solutions

To minimize the sinking of your homemade candles, follow these tips:

Ensure the pouring temperature is appropriate and within the recommended range for your specific wax type. Use the correct wick size and ensure it is properly centered in the mold. Allow the candle to cool slowly and evenly in a cool, draft-free area. Choose additives and fragrances that are compatible with your wax. Consider the type of wax you are using and select one that is less likely to sink.

By understanding and addressing the factors that contribute to the sinking of homemade candles, you can create the perfect candles that are both visually appealing and functional.

Keywords: homemade candles, sinking candles, candle making