Buyers brief a lipstick as a colour & a finish, then discover the bullet breaks in the post or at the counter. The break is rarely about the shade; it is about the wax-to-oil ratio, the mould temperature & the release, the three steps that decide whether the bullet holds its shape from the line to the hand. A colour that is perfect in the pan is worthless if the bullet snaps on the first twist.
This article covers the parts of a bullet brief that decide the result: the wax & oil skeleton, the moulding, the strength test, the colour match, the finish, the pack, & the claim line a market will let you print. Read it before you set the shade, because the choice made in the first line of the brief is the one that fixes the break rate, the wear & the feel the customer either keeps or returns.
Why a bullet breaks at the mould, not at the counter
A bullet that fails in the consumer's hand usually failed earlier at the mould, where the weakness was built in & not seen. A mould that runs a degree too warm, a release that drags, or a base that is short on structure all leave a bullet that looks whole & breaks under a small load. The factory that checks only the finished colour misses the step that actually decides the break.
The brief should name the target rather than the symptom. "Strong bullet" is a wish; "survives a drop from 0.8 m onto a hard floor at 25 C" is a test the factory can run & the brand can repeat. A brief that states the test, not the feeling, is the one that ships a bullet the channel stops returning.
The cost of a weak bullet is a relaunch, because the fault shows after the pack is printed & the run is shipped. A mould change after that point is a new tool & a new artwork, so the brief that fixes the structure up front is the one that avoids paying for the bullet twice. The structure is cheaper to set than to recover.
Wax & oil ratio: the skeleton of the bullet
The bullet is a wax network holding oil & pigment, & the ratio is the skeleton. More wax gives a harder, more break-resistant bullet that drags on the lip; more oil gives a creamier bullet that can soften in heat & lose its shape. The ratio is the first number the factory should record, because it sets everything the customer feels.
The wax choice matters as much as the amount. A high-melt wax builds a firmer bullet at a lower total load than a soft wax, so two bases with the same hardness can feel different & behave differently in heat. The brand should ask for the wax types by name, not a hardness promise, because the names are what let the brand compare one supplier with another at reorder, & the lipstick wax systems guide covers the trade in more depth.
The oil phase sets the slip & the shine. A bullet that is all structure & no oil feels dry & tugs; one that is all oil feels nice & will not hold. The balance is the formulation skill, & it shifts with the finish the brand wants, so the brief should name the finish before the ratio is locked, not after.
Moulding temperature & the release step
The bullet is cast in a mould & released, & the temperature window is narrow. Too cold & the base does not fill the tip; too warm & it slumps as it sets, leaving a blunt or a bent bullet. The mould temperature is a process parameter the factory should hold on the batch record, because a drift of a degree is the difference between a clean tip & a reject.
The release is the step most lines under-control. A mould that releases late tears the surface; one released early sticks & pulls a chunk out of the bullet. The release agent, the dwell time & the air knock all belong in the method, & the brand should ask for the method, because a bullet that looks fine on the line can fail the moment it is ejected.
The mould itself wears, & a worn mould throws a bullet with a seam or a flat that the customer reads as a defect. The tool record should name the shot count & the point at which the mould is retired, because a mould run past its life is the silent cause of a complaint nobody can trace to a formula. The tooling is part of the product for a bullet.
Bullet strength & the drop test buyers run
Strength is the property the brief should specify, because it is the one the customer tests by accident. A bullet that survives the fill & the pack can still fail when the tube is dropped or when it is wound up too far, & that failure is what the review cites. The test should be in the brief, with the height, the surface & the temperature.
The test also protects the brand from a base that is too soft for the market. A bullet bound for a hot climate needs more structure than one bound for a cool one, & a single global base will break in one & feel hard in the other. The brief should state the climate band, because the strength is set against it, not against a lab at one temperature.
The practical point is to run the test on the production bullet in the production tube, not on a hand sample. A sample twisted by hand & a bullet ejected by the line are different objects, & the line version is the one that ships. The brand should ask for the test on the filled, closed, finished tube, because that is the object the customer drops.
Colour dispersion & the batch-to-batch match
Colour in a bullet starts as a powder that has to be dispersed into the wax-oil base, & the grind decides the saturation & the evenness. A pigment stirred in, not ground, leaves clusters that read as a weaker, patchier shade & that shift between batches. The pigment dispersion step belongs in the brief, because it is what turns the stated colour into the colour the lip wears.
The match is made against a master held by both sides, in a known light, because a printed card & a bullet on the lip rarely agree. The tolerance should be written before production, with the instrument & the light, so the third batch that looks a hair warmer can be judged against a number rather than a memory. A tolerance left open is argued over later.
The batch-to-batch risk is raw material variation. The same pigment code from two lots can sit a step apart, & a factory that does not re-match at receipt will pass both lots while the brand sees a creeping shift across the season. A re-match at incoming inspection is cheap insurance against a complaint that no certificate would have caught, & it is the step a serious line actually runs.
Finish: matte, satin & gloss from the oil phase
The finish is set by the oil phase & the pigment load, not by a word on the pack. A matte bullet uses less oil & a flatter pigment so the light scatters; a gloss bullet uses more oil so the light reflects; a satin sits between. The brief should name the finish, because the base is built to it & a late change to the finish is a change to the base.
The finish also moves with wear. A bullet that is gloss in the tube can read matte after an hour as the oil is absorbed, & the customer judges the worn look, not the fresh one. The brief should ask for the finish read at wear time, not only on application, because the worn finish is what the review describes.
The pigment load interacts with the finish. A high-load matte can feel dry & emphasise texture on the lip; a low-load gloss can look weak. The balance is the formulation skill, & it shifts with the shade, so a red & a nude on the same finish need different bases. The brief that assumes one base fits all finishes will miss on at least one.
Flavour, scent & the allergen line
A lip bullet is worn where a little is ingested, so flavour & scent are not cosmetic extras, they are compliance items. The fragrance used should carry an allergen declaration & an IFRA certificate, because the lip is a higher-exposure route than the skin for a scent. The brand should ask for the declaration by name, not a generic "fragrance" line on the document.
The flavour also affects the wear feel. A sweet flavour can read as a sign of a comfortable bullet even when the base is the same, & a flavour that fades fast leaves the bullet tasting of wax, which the customer reads as old. The brief should name the flavour target & the point at the life of the bullet it should still hold, because the taste is part of the experience the review covers.
The allergen line is the one to watch at reformulation. A change of fragrance house can change the allergen set, which can change the label, so a substitute that looks cosmetic can force a reprint. The brief should state that a fragrance change is a label change, because the cheap substitute on the bench is not always the cheap one to market once the declaration shifts.
Fill weight, tube & the crimp
Fill weight for a bullet is the coat count the customer gets, & the tolerance decides whether the bullet runs out fairly. A short fill means the bullet hits the mechanism before the colour does, & a review that says "finished in days" is really a fill complaint. The weight should be set with a band & a line record, so a short fill can be answered from data.
The tube is the mechanism. A mechanism that winds too far pushes the bullet past the guard & snaps it; one that winds short leaves the bullet unusable. The mechanism spec should be confirmed against the bullet length, because the two are tuned to each other & a late change to one breaks the other. The tube is part of the formula for a bullet.
The crimp & the collar hold the bullet in the tube, & a loose crimp lets the bullet turn or drop. The crimp spec should be in the pack record, with the torque, because a second-source tube that "looks the same" often holds differently. The brand should keep the spec, because a tube change that saves a cent can cost a batch of returns.
Stability: bloom, sweat & heat
Stability for a bullet is about staying the same, not about spoiling. Bloom is the specific failure: a waxy or oily film that rises to the surface on storage, usually from a base that is out of balance or a storage that is too warm. It shows under a certain light & hides under another, so the check has to run in the light the customer uses, not only on the bench.
Sweat is the oil version of the same problem: droplets that appear on the bullet in heat, read as a defect, & signal a base that is not stable at the temperature the market reaches. The stability plan should include a heat cycle to the top of the climate band, not only a mild warm store, because the product sees the hot shelf, not the cool one.
The retention sample, opened at intervals, is the only honest read, because a bullet checked on day one says nothing about month six. The brand should ask for the sample plan with the intervals, not only the pass on the first bullet, because the failure that costs a return is the one that appears after the goods have shipped.
Claim boundaries for a lip colour
The claim line for a lip bullet is narrow, & the brief should keep to it. Colour, shine, wear, comfort & the feel on the lip are cosmetic statements most markets accept with a basis. Statements that reach toward changing the lip medically, or toward a structural effect on the tissue, cross a line the brand should not print without advice.
The border is easier to hold when the wording stays in the look & the feel. A bullet described as giving a soft, even colour is on the cosmetic side; one described as acting on the lip in a medical sense is not. The same product can be described either way, & the words on the pack are what a market reviewer reads, so the brief should specify the wording, not only the shade.
The practical move is to write the claim with the formula, not after it. A bullet built for a clean matte can support a cosmetic claim about that matte; it cannot support a claim about the underlying state. The brief that names the allowed wording up front is the one that ships a pack the reviewer passes rather than one that has to be reprinted.
Wax & format choices at a glance
The table below sets the common bullet types against the wax load they imply, the finish they give, & the point most often missed. It is a planning aid, not a fixed recipe, because the right base shifts with the climate & the pack the brand has already chosen.
| Bullet type | Wax load | Finish it gives | Watch out |
|---|---|---|---|
| Cream bullet | Lower, more oil | Soft, shiny | Softens in heat |
| Matte bullet | Higher, flat pigment | Dry, no shine | Drags on the lip |
| Satin bullet | Mid wax, mid oil | Between the two | Finicky balance |
| Sheer bullet | Low pigment, more oil | Light tint | Weak colour match |
| Long-wear bullet | High structure | Stays through eating | Can feel dry |
| Jumbo bullet | Standard, larger | Same, bigger | Needs a stronger mould |
| Twist-up crayon | Firm wax | Line, not full | Crimps if soft |
| Tint balm bullet | Balmy, low wax | Soft stain | Loses shape in warmth |
The rows are a starting point, & the order reflects the usual build of a range: a core bullet, then the matte & the gloss, then the special finishes. A brand that plans the set as one brief, with the wax system shared across the steps, avoids the mismatch where one bullet breaks while the rest hold.
What to put in the brief
State the structure & the finish before the shade, because that order is what keeps the bullet whole. Name the climate, the test, the wax types, the colour master & the claim wording, & ask the factory to record the ratio & the mould temperature so the base can be compared & re-ordered without a fresh development each time.
- The target market climate & the drop test height, surface & temperature.
- The wax types & the oil phase, by name, not a hardness promise.
- The mould temperature window & the release method on the record.
- The colour master, the light source & the tolerance for the match.
- The finish: matte, satin or gloss, read at wear time.
- The flavour & the scent, with the IFRA certificate & allergen list.
- The fill weight with tolerance & the line record.
- The tube mechanism & the crimp spec, confirmed as a pair.
Then agree how a shade is approved at reorder, because the master has to be re-read against the new pigment lot before the batch runs. A brief that fixes the match method, not only the master, is the one that holds colour across a season rather than across a single sample.
Where our capability fits
We take a bullet brief as a structure project first: we set the wax-to-oil ratio, run the mould at a held temperature, release on a method we record, & test the finished bullet in the finished tube before it ships. The colour is dispersed to a fineness that matches, the flavour is supplied with its allergen declaration, & the fill weight is recorded on the line so a short-fill question can be answered from the batch file.
We work with brands on private label (your brand on a proven base), OEM/ODM contract manufacturing & full custom formula development, & the wax system is set against your climate & your finish before the first sample. Our lines include a custom perfume, a long-wear foundation & a custom face serum, all produced with the same batch record & retention discipline a colour cosmetic needs.
Tell us the finish you want, the climate you sell into & the drop test you expect, & we will come back with a base & a mould plan rather than a shade alone. Start at our inquiry page, email capsulebiotech@163.com, or message the right team on WhatsApp: Capsule Series (capsules only) +86 158-7655-5319, Cosmetics Series (serum, hair care, body care, fragrance) +86 158-7655-5319.
General manufacturing information, not regulatory or legal advice. Pigment limits, fragrance allergen duties & claim boundaries vary by market, & the applicable rules should be confirmed for each destination before a product is placed on sale.