Can candles lose scent?

No, candles don't expire in the same way that food products do. However, they may lose their color and/or scent over time, especially if not stored properly. Candles are made by blending fragrance oils with a carrier wax. Usually, the fragrance oil will be the first to dissipate.

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Why do candle flames flicker?

When you light a candle, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick by capillary action. The wisp of smoke you sometimes see when a candle flickers is actually caused by unburned soot particles that have escaped from the flame due to incomplete combustion. Consequently, what are smokeless candles? There is described a smokeless candle which contains insect or Chinese wax, in addition to paraffin wax, to prevent generation of soot, when burning flame of the candle flares.

Correspondingly, why is my candle flame dancing?

Any bursts of air that cause your candle flame to dance around also cause your wick to use fuel at an inconsistent pace. The wick is drawing oil from the candle wax as fuel, and a buildup is created within the wick. Bursts of air cause the flame to burn less oil than the wick is taking in. Why do my candles have sinkholes? Sinkholes occur naturally from the process of the wax setting up. As wax is heated to melt it into liquid form, the wax expands literally taking up more space as it changes form from solid to liquid. This is the reasoning as to why sink holes can appear in your candles.

You can also ask why do my candles tunnel?

Candle tunneling occurs when only the center of the wax right around the wick melts and burns down. Sometimes, candle tunneling is caused by a wick that isn't large enough for the size of the candle, but more often it's caused by the timing of the first burn. Correspondingly, why do candles not burn evenly? When a candle wick is too small it can't generate enough heat to melt a large enough area of wax. In this case it will burn downwards in a hole as wide as the wick is capable of melting. This is because the solid wax needs to be raised to its melting point which takes even longer when it's resting in a cold room.