Should My Commercial Fragrance-Load Decision Be Based on Maximum Possible Scent Strength or the Lowest Percentage That Delivers the Intended Customer Experience?

Two ways to set a load, and why they lead to different candles

There are two common ways makers settle on a fragrance load. The first is to push until something breaks: keep adding oil until the candle sweats, soots or stops getting stronger, then back off slightly. The second is to decide what the candle is for, then find the smallest amount of oil that achieves it.

The first approach feels thorough. It produces a number with a clear story: this is as strong as it gets. The problem is that it answers a question no customer asked. Nobody buys a candle hoping for the upper limit of a wax's oil retention. They buy it for a bedroom, a bathroom, a living room, a gift box, a spa counter.

The second approach needs more thought at the start, because you have to describe the experience in words. But once that brief exists, every later decision gets easier. You know when a test candle passes. You know when to stop spending. And you have a reason, beyond habit, for every gram of oil in the jar.

When more strength changes the scent, not just the volume

It is tempting to think of load as a volume dial: the same music, louder. For single-note oils that is roughly true. For blends it often is not. Different materials in a blend evaporate and release at different rates, and a higher load in a hotter melt pool can push the heavier base materials forward while the light top notes stay much as they were.

CSI's Bergamot Amber is a useful example because its product page says this directly. At 6%, bergamot leads. At 8%, the page calls it balanced. At 10%, amber comes forward and the vanilla-musk base becomes more prominent. Three loads, three slightly different candles.

That means the strongest version is not simply more of the 8% candle. If your customer brief says bright and uplifting for a morning desk, 10% may actually move you away from the target while costing more. If the brief says warm and enveloping for an evening lounge, 10% may be exactly right. The load follows the brief, not the other way round.

Writing an experience brief for each product

An experience brief is three or four lines. It is not a marketing description. It is a working standard you can test against with the lid off and with the candle lit.

Notice that none of these briefs says as strong as possible. Even the living-room brief asks for the lowest load that reaches a defined point. The gifting brief is the interesting one, because cold throw sells a boxed candle and a maker may choose a slightly higher load purely for the moment the lid comes off. That is a legitimate commercial decision, as long as the hot throw at that load is still pleasant and the wick still behaves.

Room size, airflow and ventilation change how far a scent travels, so write the brief for the room your typical customer has, not for your testing room. These are general principles of how air carries scent, not measured figures; your own customer feedback is the real calibration.

Testing against the brief instead of against each other

When loads are tested against each other, the strongest candle almost always wins the comparison. That is not a finding; it is how noses work side by side. When loads are tested against a written brief, a softer candle can win because it matches the target better.

What the maximum costs when it is not needed

Bergamot Amber is ₹5,437.00 per kg, or ₹5.437 per gram. In a 200 g candle, 8% is 16 g, which is 16 × ₹5.437 = ₹86.99. At 10% it is 20 g, which is 20 × ₹5.437 = ₹108.74. The difference is ₹21.75 per candle.

On a run of 300 candles for a season, the gap is 300 × ₹21.75 = ₹6,525.00. That money buys nothing a bedroom customer will value if the brief called for a soft, bergamot-led scent, and it may actually move the candle away from what they chose.

There is also a cost that does not appear on the oil invoice. A higher load can change fuel delivery to the wick, sometimes leading to carbon build-up or a larger flame. If that means sizing the wick differently, you are now running two variables for a benefit the brief did not ask for. And an over-scented candle in a small room is one of the more common reasons a customer does not reorder; they rarely complain, they simply choose something else next time.

None of this means the upper range is useless. Knowing the maximum tells you your headroom if a product brief changes, if you move to a larger vessel, or if a customer asks for a stronger version. Test it, record it, and keep it on file. Just do not make it the default for every jar.

One more practical point: once a brief and its load are fixed, write both on the batch sheet. When someone new pours for you, or when you revisit the product a year later, the reason for the number travels with it. A load without a reason tends to creep upwards, one just to be safe gram at a time, until you are back at the maximum without ever having decided to go there.

The same record helps when a customer asks for a stronger version. You can check the brief, see whether their room is larger than the one you designed for, and offer the tested higher load as a deliberate variant instead of quietly changing the standard recipe for everyone.

Here is a simple policy you can adopt: each product has a written experience brief; its load is the lowest tested percentage that meets that brief after cure; the maximum tested load is recorded but used only where a brief requires it. Three sentences, and every future load decision has a rule to follow.

Where this page fits

CSI already has guides that cover parts of this question. This page answers the specific oil-in-wax question above; these go deeper on the rest:

Three things to buy for this job

Frequently asked questions