Wax melts are an unusually efficient way to scent a room and most households use them wastefully, changing the wax every time out of a reasonable assumption that it must be spent.
Usually it is not.
How much to use
One cube for a small to average room. Two only for a large open space, and even then you may find one sufficient.
More wax does not produce more fragrance at any given moment, since scent release depends on the surface area of the melted pool and its temperature rather than the depth of wax beneath it. A deeper pool simply lasts longer, and risks overflowing as the wax expands.
How many burns you actually get
Considerably more than one. A single cube typically gives several hours of good scent across multiple sessions, and the wax does not need replacing between them.
Let it cool and solidify in the dish, then light the tealight again next time. The wax will re melt and release fragrance again. Most cubes give three or four sessions before the scent genuinely goes.
How to tell when a melt is spent
Two signs, and the first is more reliable.
The scent stops. Not fades slightly, stops, so the room smells of warm wax rather than of fragrance. If you light the burner and after twenty minutes cannot detect anything, that cube is done.
The colour lightens, since many of the compounds carrying colour also carry scent. A cube that started deep amber and is now pale is usually spent, though this is less reliable than the first test.
What does not indicate a spent melt is that the wax has been used before. Wax that has melted and re solidified looks used and frequently is not.
Changing scent without contamination
Once a melt is done, remove it completely and wipe the dish before adding another fragrance.
Residual wax from a strong scent will mix with the next and produce a muddle. Wipe with kitchen paper while the dish is still slightly warm, then with a little washing up liquid on a cloth if the previous scent was strong.
The cold pop out method
The tidiest way to remove a spent melt. Put the burner dish, or the whole burner if it is one piece, in the freezer for around an hour.
Wax contracts as it cools, more than ceramic does, so the disc shrinks slightly away from the sides. Light pressure with a thumb from underneath, or a gentle push with a blunt implement, and it usually lifts out whole with no scraping.
The alternative is to light the tealight for a minute or two, which softens the underside enough to slide the disc out, then wipe the dish while warm. Both work, and the freezer method leaves less residue.
Never pour it down the sink
Melted wax solidifies in cold pipes, which is a plumbing problem you do not want. Wipe out with kitchen paper and put it in the bin.
Storing melts so they keep their scent
Wax melts lose fragrance in storage, which is why an old packet smells weaker than a new one.
Keep them sealed, since exposure to air is what depletes them. Keep them cool, because warmth accelerates the loss and can also cause them to soften and stick together. And keep them out of direct sun, which does both.
A drawer or a cupboard away from a radiator is fine. What is not fine is an open dish of melts on display near a heat source, which looks attractive and empties them of scent within weeks.
Getting the last of a candle
A useful trick. When a container candle is finished, with around a centimetre of wax remaining that you should not burn, warm the jar gently in a bowl of hot water, lift the wax out, and use it as a melt in an oil burner.
That recovers the last of an expensive fragrance safely, and it saves the container for something else. Our guide to why candles tunnel covers getting the most from a candle before that point.
Questions people ask
How many times can you use a wax melt?
Usually three or four sessions from a single cube. Let it solidify in the dish between uses and relight, since the wax re melts and releases fragrance again.
How do I know when a wax melt is finished?
The scent stops rather than fades, so the room smells of warm wax rather than fragrance. Lightened colour is a secondary sign. Wax that has simply melted and re set before is not spent.
How much wax melt should I use?
One cube for most rooms. More wax does not increase the fragrance at any moment, since release depends on the pool surface and temperature rather than depth.
What is the easiest way to remove old wax?
Put the dish in the freezer for an hour. The wax contracts and usually lifts out whole with light pressure, leaving little residue.
How should I store wax melts?
Sealed, cool and out of direct sun. Air exposure depletes fragrance and warmth accelerates it, which is why an open display dish near a radiator empties them within weeks.
