Running a fragrance activity for children: the sub said no, and some of its reasons are wrong

A parent asked r/DIYfragrance something very specific: could anyone recommend a kit for setting up a fragrance bar for children aged 8 to 10, for her daughter's birthday party? Party services offering this charge around a thousand dollars and bundle in things she does not need, like party hosts. She wanted something simple that combines three or four notes, and — "ideally something that uses cleaner ingredients. I'd be happy to pay more for better quality."

Forty replies, nearly all one direction. The top one, at 94 points:

"I'm going to be that downer who says this probably isn't age appropriate for 8-10yos. Not only cos there's chemicals involved but I don't think they'll even appreciate it that much… Heck even the kit on perfumers apprentice says intended for 12 and over."

After reading the replies, the parent said something admirably honest: "I know nothing about perfume as I don't use it… even forgot it has alcohol."

This article is not joining the chorus. The direction of the sub's answer is right, and the quality of its reasons varies a lot — and one of them is wrong. Here they are one at a time, checked where checking was possible.

The short version

• IFRA itself really is far stricter on products for children. Parsing the full IFRA Standards text: of the 171 materials listing both Category 4 (fine fragrance) and Category 5D (baby cream, baby oil, baby talc), 156 (91%) are stricter in 5D, by a median of 11.6-fold, with one material at 130,303-fold.
• But Category 5D is babies, not eight-year-olds. Using the infant numbers as the reason gets the direction right and the argument wrong.
• "Citrus can be phototoxic, make sure your citrus hydrosols are sun-safe" is wrong. The phototoxic molecule is bergapten, which boils at 412 °C and is a solid at room temperature with a melting point of 188 °C. A hydrosol is what condenses out of 100 °C steam. That molecule does not make the trip.
• The hydrosol suggestion is a good one, and a hydrosol is not water. GC-MS of lavandin hydrosol finds linalool, 1,8-cineole, camphor, linalyl acetate and 4-terpineol; in the same study, the flower hydrolate completely inhibited radish seed germination.
• The mechanism that actually works is pre-dilution, not "clean". But note that the median Category 4 limit across 171 restricted materials is 0.60%, with 59% under 1% — so "dilute everything to 10% and it's fine" is bad arithmetic.
• The strongest objection in the thread is ingestion, not skin. Several replies raised it independently, and it is the one I find holds up best.

About a 10 minute read.

What IFRA thinks about children: the numbers

IFRA's standards split products into twelve categories, each with a maximum concentration in the finished product. Category 5D is baby cream and lotion, baby oil, and baby powder and talc.

Parsing the full public IFRA Standards text (Amendment 49) for materials carrying both a Category 4 and a Category 5D figure gives 171 of them:

Stricter in 5D than in 4	156 (91%)
Median ratio	11.6-fold
Largest ratio	130,303-fold
Equal in both	15

The widest gaps:

Material	Category 4	Category 5D	Ratio
Methoxycyclododecane	0.43%	0.0000033%	130,303×
Carvomenthone	1.9%	0.00064%	2,969×
Tetramethyl bicycloheptene propionaldehyde	1.3%	0.00046%	2,826×
3,4,5,6,6-Pentamethylhept-3-en-2-one	1.9%	0.0032%	594×

For that 130,303-fold case — methoxycyclododecane, CAS 2986-54-1 — the intrinsic property IFRA lists as driving the limit is systemic toxicity. Not sensitization. The same material is permitted at 0.43% in an adult fine fragrance and at thirty-three parts per billion in a baby cream.

So "the fragrance industry doesn't think children are different" does not hold. The standards themselves say the opposite.

But 8 to 10 is not infancy

Those numbers are persuasive, and easy to misuse. Category 5D is baby products, and the children in question are 8 to 10.

Why infant skin differs is documented. Darlenski and Fluhr, in the International Journal of Cosmetic Science in 2023, reviewed how the skin barrier adapts after birth and listed the specific differences between infant and adult skin:

• The infant stratum corneum is thinner, structured by thicker corneocytes with a more anisotropic surface;
• Lower levels of natural moisturizing factor and its constituents, together with increased epidermal protease activity, make baby skin dry;
• The epidermis has an accelerated proliferation rate, with a clinically competent permeability barrier in term neonates despite higher baseline transepidermal water loss;
• The newborn skin surface is less acidic, which could increase susceptibility to diaper and atopic dermatitis.

All of that is about neonates and infants. An eight-year-old's barrier maturity is close to an adult's, not close to a newborn's.

So using Category 5D numbers to argue that 8 to 10 year olds should not touch perfumery puts a real figure to the wrong age. To object, you need a different reason — and the thread does contain better ones.

The "clean" misunderstanding, and one wrong claim

The parent asked for "cleaner ingredients". One reply asked what she meant, and offered a good alternative:

"I'm not sure what you mean by 'cleaner ingredients', but if you mean natural extracts, that's even pricier because of the extraction process… my best suggestion would just be getting a bunch of hydrosols and some little spray bottles for them. Then you'd be able to access natural floral scents at a far lower price and wouldn't have to worry about the hazards of alcohol or various other chemicals."

The parent replied: this is exactly what I was thinking about when I said "cleaner".

That is a good suggestion. But another reply added:

"Citrus can be photo toxic, can cause sun sensitivity. Make sure your citrus hydrosols are sun-safe."

That one is wrong, and it is wrong in an instructive way.

Citrus phototoxicity comes from furocoumarins, chiefly bergapten (5-MOP, CAS 484-20-8). Its physical properties:

	Bergapten	Psoralen
Molecular weight	216.19	186.17
Boiling point	412–413 °C	362–363 °C
Melting point	188 °C (solid at room temperature)	163–164 °C
Vapour pressure	—	0.000019 mmHg

A hydrosol is the condensate of steam distillation, which runs at around 100 °C. A molecule that boils at 412 °C and is solid at room temperature does not travel with that steam. It stays in the still.

Which is precisely how bergapten-reduced bergamot is made: separate out the high-boiling material and keep the volatile aroma. A hydrosol is structurally the "volatile half only" fraction.

So citrus hydrosol is the last thing at that party to worry about for phototoxicity. Citrus essential oil is an entirely different matter.

I single this out not to correct a well-meaning commenter but because it demonstrates a common reasoning error: treating "citrus" as the unit of risk, when the unit of risk is the molecule.

A hydrosol is not water

That said, a hydrosol is not harmless water either, and this deserves stating plainly, because "natural scented water" is exactly the phrase that reassures a parent.

Politi and colleagues, in Molecules in 2020, compared for the first time two lavandin (Lavandula × intermedia) aromatic waters obtained from different plant organs, the flowers and the stems. GC-MS showed semi-quantitative differences between the major metabolites, including linalool, 1,8-cineole, camphor, linalyl acetate and 4-terpineol, with 1H-NMR and LC-MS confirming their presence.

Two further results are worth knowing:

• Both hydrosols showed good repellency against the food pest Tribolium confusum, with RD50 values of 3.6 and 3.3 µL cm⁻² for flowers and stems;
• The flower hydrolate completely inhibited germination of radish seed, which the authors suggest gives it possible application as a natural herbicide.

A liquid that stops seeds germinating outright is not "just water with a smell". It carries real concentrations of linalool, cineole and camphor, and the latter two are exactly the molecules that warrant care around young children.

Hydrosols have a separate practical issue that the thread got right: short shelf life. They are a water phase, usually unpreserved, and should be discarded within a few months of opening. One reply suggested refrigeration to extend it, which is correct.

The mechanism that actually works: pre-dilution

The most useful reply in the thread is one sentence:

"Stick to pre-diluted cosmetic grade materials. Don't use anything that could cause burns if they get it on their skin."

That is worth more than the rest of the thread combined, because it names a mechanism rather than a category. You cannot control what a child mixes on the table, but you can control the concentration in every bottle on it. If every bottle is already at X%, then even a child emptying one whole bottle into their mix cannot exceed X% in the finished product.

But do not guess the dilution generously. Pulling the 171 restricted materials that carry a Category 4 figure:

Category 4 limit	Materials
Median	0.60%
Under 0.1%	20 (12%)
Under 0.5%	76 (44%)
Under 1%	101 (59%)
Under 2%	136 (80%)
Under 5%	162 (95%)

The median is 0.60%. So the intuition that "everything at 10% is safe" is wrong — if a restricted material is on the table, a 10% stock still exceeds its limit.

The cleaner move is to have no restricted material on the table at all. The IFRA index holds 263 standards:

Type	Count
Restriction	170
Prohibition	83
Specification	10

Those 263 names are lookup-able, and we have written up how. Check every material you plan to put out against those 263 first, and talk about dilution second.

The strongest objection in the thread

Several replies raised the same thing independently, and I think it is the objection that holds up best: ingestion.

"It just needs one dumbass daring another kid to chug down a bottle of whatnot and the party ends with a visit of the ER."

"You're absolutely going to want to make sure they don't think it's safe to drink just because it smells good, though. When I was 8, girls I would visit with were trying to convince me to eat the cream eyeshadows out of their makeup kits, so…"

This one tracks age far better than dermal absorption does. An eight-year-old's skin is close to an adult's. An eight-year-old's judgement about whether something that smells like candy is candy is not.

And the carrier in perfume is ethanol. The parent herself said she "forgot it has alcohol" — which is the real risk point in this activity. Not sensitization: a bottle of concentrated ethanol that smells like sweets, in front of ten children.

(Going the hydrosol route shrinks this risk a great deal without eliminating it. Hydrosols still should not be drunk.)

What the parent did

Worth recording, because she handled it well.

After reading everything, she wrote: "Ok I just read all the comments and realizing that it's more dangerous than I thought. I had no idea of the chemicals/alcohol involved." She dropped the fragrance bar from the party in favour of lip scrub, and kept the hydrosol idea for a summer project at home with her kids.

She asked, she listened, and she changed the plan. One reply in the thread was "is this about your daughter or about you?" — which was neither necessary nor informative. Someone answered it immediately: "Love the casual and unnecessary psychoanalysis thrown in lol."

If you still want to run one

Assuming you have read the above and still want to do this, here is the order I would work in:

1. Raise the age. The thread's consensus is 12 and over, and Perfumer's Apprentice labels its own kit 12+. One reply proposed "14 year olds, pre-diluted materials, least toxic ones, five ingredients max" — that is an executable version.
2. Check the 263 first. Nothing on the table should appear in IFRA's prohibitions or restrictions.
3. Pre-dilute everything, with the concentration written on the bottle. The right concentration depends on what you put out, not on 10% sounding safe.
4. If you go the hydrosol route, leave alcohol out entirely. Those are two separate risk sets; do not mix them.
5. A "do not drink" label on every bottle, and say it out loud once beforehand.
6. Ask about allergies. One reply put it well: if you are using natural materials, understand every ingredient in them and make sure no child is allergic.

What this doesn't establish

The IFRA category statistics are my own parse. I extracted category figures from each standard block in the full public IFRA Standards text (Amendment 49) by script. The parse may miss standards with unusual layout and may split some pages incorrectly, so 171 is what this parse found, not a count published by IFRA. The median and extreme ratios rest on that same parse.

Amendment 49 is not the current version. IFRA's amendments continue; consultation on the 52nd closed in the first half of 2026. Any figure you intend to rely on should be checked against the current version.

The Category 5D definition I confirmed from an external source, not from the standards text in front of me — that document lists figures without defining the categories.

"An eight-year-old's skin is close to an adult's" is an inference. Darlenski and Fluhr cover neonates and infants and give no data for 8 to 10 year olds. I inferred the direction from barrier maturation after infancy, but there is no direct measurement for that age band here.

Hydrosol composition varies by plant, plant part and distillation conditions. Politi covered two organs of one species, which does not generalise to all hydrosols.

I have not tested any hydrosol for phototoxicity. "Bergapten does not make the trip" is a physical inference from boiling and melting points. The direction is solid; it is not a measurement report.

References

M. Politi et al., Reconsidering Hydrosols as Main Products of Aromatic Plants Manufactory: The Lavandin (Lavandula intermedia) Case Study in Tuscany, Molecules, 25(9), 2225 (2020). PMID 32397385. doi:10.3390/molecules25092225

R. Darlenski, J. W. Fluhr, How do the skin barrier and microbiome adapt to the extra-uterine environment after birth? Implications for the clinical practice, International Journal of Cosmetic Science, 45(3), 288–298 (2023). PMID 36692960. doi:10.1111/ics.12844

Related: Citrus phototoxicity, Are naturals gentler, Is this material still legal, How risky is DIY perfumery.