What Makes a Candle Smell Stronger? 9 Factors That Affect Fragrance Throw
What Makes a Candle Smell Stronger? 9 Factors That Affect Fragrance Throw
There’s nothing quite like lighting a candle and watching its fragrance gradually fill the room.
But sometimes a candle can smell incredible when you first pick it up, yet seem much less noticeable once it is burning.
So, what makes one candle smell stronger than another?
The answer isn’t simply “more fragrance oil”.
A candle’s fragrance performance is influenced by a combination of factors, including the fragrance itself, the wax, the wick, the vessel, the fragrance concentration, the way the candle is made and even the room in which it is being burned.
This is known as fragrance throw.
In this guide, we’re looking at nine of the most important factors that can affect how strongly a candle’s fragrance is experienced, and why creating a great-smelling candle is much more complicated than simply adding more fragrance.
What Is Candle Fragrance Throw?
Fragrance throw is the term used to describe how a candle’s fragrance is experienced.
There are two types you’ll commonly hear about: cold throw and hot throw.
Cold throw is the fragrance you notice when a candle is unlit. It is the scent you experience when you open the box, pick up the candle or smell it sitting on a shelf.
Hot throw is the fragrance you experience while the candle is burning.
A candle can have a fantastic cold throw but a weaker hot throw, or vice versa. This is why judging a candle purely by how it smells when it is unlit doesn’t always tell you how it will perform when burning.
There are several things that influence this performance.
Let’s look at them.
1. The Fragrance Oil Makes a Difference
The fragrance itself is one of the biggest factors affecting how a candle smells.
Different fragrance oils contain different combinations of aromatic ingredients, and different fragrance profiles can behave differently when used in a candle.
Fresh, citrus, aquatic and lighter fragrances can create a very different scent experience from deeper woody, amber, musky or spicy fragrances.
That doesn’t necessarily mean one fragrance is “stronger” than another.
Fragrance strength and fragrance character are two different things.
A rich, complex fragrance can sometimes feel more noticeable because of the way its individual notes develop, while a lighter fragrance may create a more subtle atmosphere even when it has been correctly formulated.
This is one reason we don’t simply judge a fragrance by smelling the oil straight from the bottle.
A fragrance needs to work within the complete candle formulation.
2. Fragrance Load Matters - But More Isn’t Always Better
It’s easy to assume that adding more fragrance oil will automatically create a stronger-smelling candle.
It doesn’t work quite that simply.
Fragrance load refers to the amount of fragrance oil used in relation to the amount of wax.
Increasing the fragrance concentration can affect how a candle performs, but there is a point where adding more isn’t necessarily beneficial. A candle needs to be properly formulated and tested so that the fragrance, wax and wick work together.
Too much fragrance can also affect how a candle burns.
At Ember & Oak, our candles are formulated using a 9% fragrance load, alongside our coconut-soy wax and wooden wicks.
The aim isn’t simply to use as much fragrance as possible.
It’s to create a balanced candle that performs properly while delivering the sophisticated fragrance experience we’re looking for.
3. The Wax Can Affect Fragrance Performance
The wax isn’t just the material that gives a candle its shape.
It plays an important role in how the finished candle performs.
Different waxes and wax blends have different characteristics, and they can interact differently with fragrance oils.
At Ember & Oak, we use a premium coconut-soy wax blend because it suits the type of candles and fragrances we create.
The relationship between wax and fragrance is one of the reasons a candle maker can’t simply take any fragrance oil, pour it into any wax and expect exactly the same result.
The complete formulation matters.
If you’d like to learn more about why we chose this wax, read our guide to Why Coconut-Soy Wax?
4. The Wick Controls More Than the Flame
A candle wick might look like a relatively simple part of the candle, but it has an important job.
The wick controls how the candle burns and how much heat is produced.
As the candle burns, heat melts the surrounding wax and creates a melt pool. That process plays a role in how fragrance is released into the surrounding air.
This means the wick needs to be properly matched to the rest of the candle formulation.
The right wick isn’t necessarily the largest wick or the one that produces the biggest flame.
It’s the wick that works appropriately with the particular combination of wax, fragrance, vessel and other factors.
At Ember & Oak, we use crackling wooden wicks as part of our candle design, giving our candles the distinctive gentle crackle that complements the fragrance experience.
For more information, take a look at Wooden Wick vs Cotton Wick: Which Candle Wick Is Better?
5. The Melt Pool Matters
When a candle burns, the heat from the flame melts the wax around the wick, creating what is known as the melt pool.
The melt pool is an important part of the candle’s burn performance.
As the wax melts, fragrance is released and can move into the surrounding air.
This is why wick selection and burn performance matter when it comes to fragrance.
A properly tested candle should be designed so that the wick, wax, fragrance and vessel work together rather than treating each component as a completely separate part of the candle.
This is also why changing the wick can change the way a candle performs, even if the wax and fragrance remain exactly the same.
6. Candle Size and Vessel Diameter Matter
Two candles can contain the same fragrance and still produce a different fragrance experience.
One reason is the size and shape of the candle vessel.
The diameter of the vessel affects the area of wax that needs to melt and therefore influences how the candle burns.
A narrow candle and a wide candle don’t necessarily behave in the same way, even when they contain the same wax and fragrance.
This is another reason why candle making involves testing the complete product rather than simply calculating a fragrance percentage and assuming everything else will take care of itself.
7. Give the Candle Time to Develop
Curing is another factor that candle makers need to consider.
After a candle has been poured, allowing it to rest gives the wax and fragrance time to settle into the finished formulation.
The exact curing requirements can vary depending on the wax, fragrance and formulation, so there isn’t one universal number of days that applies perfectly to every candle.
For that reason, responsible candle making involves testing the particular formulation rather than relying on a single generic rule.
At Ember & Oak, our candles are made with care and tested as finished products so that we’re not simply judging the fragrance at the point it is poured.
8. Your Room Can Change How Strong a Candle Smells
Even a well-formulated candle can smell very different depending on where you burn it.
A candle burning in a small bedroom will naturally create a different fragrance experience from the same candle burning in a large open-plan living space.
Things such as:
- Room size
- Ceiling height
- Ventilation
- Air movement
- Open windows
- Draughts
- Other smells in the room
can all affect how you experience a fragrance.
This is why you shouldn’t necessarily judge a candle’s fragrance performance based on one room alone.
A fragrance that feels beautifully noticeable in a smaller space may feel much more subtle in a large, well-ventilated room.
9. Your Nose Can Adapt to the Fragrance
There’s another factor that has nothing to do with the candle itself.
Your sense of smell can adapt to familiar scents.
If you’ve been around the same fragrance for a long time, your brain can become less responsive to it. The fragrance may still be present, but you may stop noticing it as strongly.
This is sometimes called olfactory adaptation.
It’s one reason someone can walk into a room and immediately notice a candle burning, while the person who has been sitting beside it for an hour barely notices it anymore.
So if you think your candle has suddenly become weaker, try leaving the room for a while and coming back later.
You may find that the fragrance is much more noticeable when you return.
For more information, take a look at our article: The Science of Scent
Does More Fragrance Oil Mean a Stronger Candle?
Not necessarily.
This is probably one of the biggest misconceptions surrounding scented candles.
A candle’s fragrance performance isn’t determined by one ingredient.
It’s the result of the relationship between:
Wax + Fragrance + Wick + Vessel + Heat + Burn Conditions
Increasing the fragrance load without considering everything else can create an unbalanced candle rather than a better one.
The goal should be a well-formulated candle, not simply the highest possible fragrance concentration.
That’s why professional candle making involves testing the finished product rather than relying on a single calculation.
How Ember & Oak Approaches Fragrance
At Ember & Oak, we believe a great candle should be about more than simply making a room smell “strong”.
Our candles are designed around a complete fragrance experience.
Each candle is hand-poured in South Wales using premium coconut-soy wax, carefully selected fragrance oils and crackling wooden wicks.
Our collection focuses heavily on sophisticated, men’s-fragrance-inspired home fragrance, giving familiar fragrance styles a new place within the home.
From fresh and clean scents to deeper woody, warm and sophisticated fragrances, our aim is to create candles that feel luxurious both when they’re sitting unlit and when they’re burning.
We don’t believe that more fragrance automatically means a better candle.
We believe in getting the whole formulation right.
Find Your Signature Ember & Oak Fragrance
Whether you prefer something fresh and clean, dark and woody, warm and seductive or bold and modern, there’s an Ember & Oak fragrance waiting to become part of your home.
Explore our collection of 25+ fragrance-inspired scents and find the one that suits your space.
Frequently Asked Questions
Why does my candle not smell very strong?
There are several possible reasons. Fragrance performance can be influenced by the fragrance itself, wax, fragrance load, wick, vessel, burn conditions, room size and even your own sense of smell.
Does more fragrance oil make a candle stronger?
Not necessarily. A candle needs to be properly formulated so the fragrance, wax and wick work together. Simply increasing the fragrance concentration doesn’t guarantee better fragrance throw.
What is hot throw?
Hot throw is the fragrance you experience while a candle is burning.
What is cold throw?
Cold throw is the fragrance you experience when a candle is unlit.
Does candle wax affect fragrance?
Yes. Different waxes and wax blends can behave differently with fragrance oils and can therefore affect the finished candle’s fragrance performance.
Do wooden wicks make candles smell stronger?
Not automatically. A wick affects how a candle burns and therefore forms part of the overall candle formulation. The wick needs to be properly matched to the wax, fragrance and vessel.
Why can I smell my candle less after a while?
Your sense of smell can adapt to a familiar fragrance. If you’ve been around the same scent for a long period, you may notice it less even though the fragrance is still present.
Does room size affect how strong a candle smells?
Yes. A fragrance can feel much more noticeable in a smaller room than in a large or highly ventilated space.
How long should I burn a scented candle?
Always follow the candle maker’s specific candle-care instructions. Burning conditions can vary between candles, so don’t assume that one burn time is suitable for every candle.
Final Thoughts
Creating a great-smelling candle is about much more than adding fragrance oil.
The fragrance, wax, wick, vessel, formulation, curing process and burning environment all contribute to the final experience.
That’s why a well-made candle isn’t simply about how much fragrance it contains.
It’s about how everything works together.
At Ember & Oak, that’s exactly what we’re aiming for: luxury home fragrance, carefully formulated and hand-poured in South Wales, with scents inspired by some of the world’s most recognisable fragrance styles.
Because the best candle isn’t necessarily the one that smells the strongest.
It’s the one you want to keep burning.