Decoration is the part of a packaging project that gets designed last & decided first. A brand approves a bottle, then hands over artwork that was drawn for a flat screen, & discovers that the curve will not take it, the colour will not match the carton, or the print rubs off in a courier bag. The failure is never the printer's skill. It is that the substrate, the method & the artwork were chosen in the wrong order, & by the time it shows up, the mould is already made.
This article sets out how silk screen & hot stamping are specified on cosmetic packs: what each method does to a surface, which substrates will take which finish, the artwork rules that decide whether a logo survives at small size, how colour is matched across a bottle, a closure & a carton, what a durability test should cover, & how the cost structure changes with run size. It is written for the buyer who has to approve the decorated sample. Print methods for labels are covered in our print techniques guide, & other decoration routes in our bottle decoration guide.
Why decoration is a substrate problem first
Every decoration method is a relationship between an ink or a foil & a surface. Glass, coated glass, polypropylene, PET, aluminium & a lacquered wooden barrel each present a different surface energy, a different hardness & a different tolerance to heat, & a method that is perfect on one is marginal on another. Choosing the pack first & the decoration second is how a project ends up with a finish nobody can guarantee.
The practical consequence is that the substrate question has to be asked before the artwork is finalised. A design with fine detail needs a surface that will hold it; a design with a large solid area needs a method that lays down enough material without crawling; a design that has to survive handling needs a finish that sets hard rather than one that sits on top.
The second consequence is that the same brand colour reads differently on different substrates. A logo that matches the carton on paper will not match it on a curved frosted bottle, because the background, the gloss & the way the ink sits all change the reading. Matching is a specification with a tolerance, not a hope.
Silk screen: how it works & where it fits
Silk screening pushes ink through a mesh onto the surface, one colour at a time, with a screen made for each colour. It lays down a relatively thick film, which is why it covers well on dark surfaces & on curved glass, & why it has a slightly raised feel that reads as quality on a bottle. It is the workhorse method for glass & for many plastic packs.
The strength is opacity & durability. A properly hardened screen ink resists handling, resists the alcohol in a fragrance & survives a warehouse, which is why it is the default for perfume bottles & for anything that will be handled a great deal. The limitation is that each colour is a separate screen & a separate pass, so a multi-colour design costs more in set-up & accumulates registration risk with every colour added.
Halftones & photographic detail are the other limitation. Screen printing reproduces solid areas & clean lines better than gradients, & a design built in a graphics package with soft shading will not reproduce the way it looks on screen. Simplifying artwork for the method is normal & it should happen before the screens are made.
Hot stamping: foil, heat & the surface
Hot stamping presses a thin metallic or pigmented foil onto the surface with a heated die. It gives the crisp, mirror-like metallic mark that a brand usually wants for a logo, & it does it in one pass with no drying time. It is the standard route for gold, silver & coloured metallic marks on closures, cartons & bottles.
The limitation is that it needs heat, pressure & a surface that will accept the foil. Thin-walled plastic that deforms under the die, a soft coating that will not release, or a surface with a texture that breaks the contact will all produce a patchy mark. Testing on the production substrate, with the production die, is the only way to know.
Foil choice is the other variable. Metallic foils give the classic look, pigmented foils give a flat colour with a slight sheen, & a matte foil gives a subdued mark that suits a minimal design. The wrong foil on the right surface produces a mark that looks cheap rather than premium, & the difference is visible in a photograph.
Artwork rules: line weight, registration & small text
The three artwork rules that decide whether a decoration succeeds are line weight, registration tolerance & text size. Thin lines & small reversed text are the first things to disappear in production, because ink spreads slightly & foil does not fill a fine recess. A minimum line weight agreed at the design stage prevents a logo that looks right in a proof & wrong on the bottle.
Registration is the alignment between colours & between the print & the pack. Every additional colour adds a registration step, & on a curved container the available registration window is smaller than on a flat one. A design that depends on two colours meeting exactly is a design that will produce a higher reject rate, & the reject rate is a cost the brand pays.
Text size matters for a legal reason as well as an aesthetic one. Mandatory information has to remain legible after decoration, & a small font on a curved or textured surface can fail a legibility check. Where a brand wants a minimal look, the mandatory text has to be placed where it can be printed legibly rather than hidden in a design detail.
Colour matching across substrates
Colour matching on packaging is done against a standard, under a defined light source, with an agreed tolerance. That is the only way a bottle, a closure & a carton end up looking like one product. Without a standard & a tolerance, matching becomes a matter of opinion at the approval stage & a disagreement at the goods-in stage.
The light source matters because metamerism is real: two samples can match under one light & differ under another. A brand selling through retail should specify the lighting the match is judged under, & should check the assembled pack under the light the customer will see rather than only under a bench lamp.
The substrate changes the colour even with a perfect match. Ink on a frosted surface reads lighter, ink over a coloured glass reads different again, & foil reflects the background. Where a brand wants consistency across a range with several pack types, the artwork may need a different colour formulation per substrate to look the same.
Durability: what a rub test should cover
A decoration has to survive the journey, the shelf & the bathroom. The tests are ordinary: a rub test with a defined material & a defined number of cycles, a tape test for adhesion, a solvent or alcohol rub for products that contain alcohol, & a check after the pack has been stored at temperature. Each simulates something real rather than something abstract.
The failure modes are predictable. Ink that has not set properly rubs off on hands & in cartons. Foil lifts at the edges on a surface with poor release. A print on a flexible tube cracks when the tube is squeezed. All three are caught by testing the decorated pack in the way it will be used rather than by looking at a fresh sample.
Transit is the part brands forget. Packs rubbing against each other in a master carton, or against a divider, produce scuffing that never happens in a sample box. A simple transit simulation with the actual packing arrangement is cheap & catches the most common complaint about decorated packs.
Cost structure: screens, plates & run size
Decoration cost has two parts: a fixed set-up & a variable per-unit cost. Screens, dies, plates & set-up time are the fixed part, & they are the reason a small run of a decorated pack costs far more per unit than a large one. Ink, foil & the machine time per piece are the variable part, & they change much less with quantity.
The consequence for a first order is that the number of colours is the main lever. A two-colour screen print on glass & a four-colour design differ substantially in set-up, in registration risk & in reject rate, & the difference is larger at low volumes. Where a brand is testing a market, a simpler decoration on the first run keeps the unit cost survivable.
Tooling also carries a lead time. A die has to be made, a screen has to be made, & neither can start until the artwork is final & the substrate is fixed. In most packaging projects the decoration tooling, not the mould, is the item that slips, because it is commissioned last.
Where each finish fits by pack type
Glass takes screen printing well & takes foil well, & it is the most forgiving substrate for both. Coated or frosted glass changes the reading of the colour & needs its own test. Plastic is more variable: some grades print directly, some need a pre-treatment or a primer to hold ink at all, & some will not take a hot foil without a coating.
Aluminium & metalised components take foil cleanly & give a crisp mark, which is why closures are usually foiled rather than printed. Tubes are usually printed rather than foiled, because the surface flexes in use & a foil mark on a squeezed tube cracks. Flexible packs in general favour a decoration that moves with the substrate.
Cartons are a different world: they are flat, they take offset print, foil & embossing, & they are where a brand can carry the most design detail cheaply. The usual answer for a premium look at a modest volume is a simple decoration on the pack & the detail on the carton.
Approving decorated samples
The approval set should be small & specific: a decorated pack made on the production substrate with the production method, a colour standard with the agreed tolerance, & a durability result from the agreed tests. A sample made by a different method, or on a similar but not identical substrate, tells the brand very little.
The golden sample has to include the decoration. A decorated pack, kept as the reference, is what a reorder is compared against, & it is the only way to settle a dispute about whether the print has drifted. Where a brand approves artwork but keeps no physical decorated reference, every reorder becomes a fresh negotiation.
The approval should also cover the reject standard. Decoration on a curved surface produces some variation, & a brand that has not agreed what is acceptable will either reject good packs or accept poor ones. A written acceptance criterion, ideally with a limit sample, is the cheapest quality agreement in the project.
Silk screen & hot stamping decisions at a glance
The table below sets the main decisions against what each changes, where the cost lands in practice, & the point most often missed. It is a working comparison rather than a rule, since the right route depends on the substrate, the run size & the design.
| Decision | What it changes | Where the cost lands | What is easy to miss |
|---|---|---|---|
| Method: screen or foil | Film build, crispness & what the mark feels like | Screens & passes, or a die & foil | Foil needs heat & a surface that releases |
| Number of colours | Registration risk & reject rate | Set-up per colour & slower approval | Curves have a smaller registration window |
| Substrate preparation | Whether the ink or foil adheres at all | Pre-treatment, primer or coating step | Some plastics will not take a foil untreated |
| Artwork simplification | Whether fine detail survives production | Design time before the screens are made | Screen print does not reproduce soft shading |
| Colour standard | Whether bottle, closure & carton agree | Matching work & possible rejections | Metamerism means the light source must be named |
| Durability testing | Whether the mark survives transit & use | Test time & reformulation of the finish | Rubbing in a master carton is the usual failure |
| Run size | Fixed set-up spread across units | Unit cost at low volumes | Decoration tooling, not the mould, usually slips |
The rows are a starting map rather than a price list. A brand that fixes the substrate, simplifies the artwork for the method & agrees a colour tolerance before tooling gets a decorated sample that looks like the design; a brand that hands over screen artwork & asks for it on glass gets three rounds & a compromise.
What to put in the brief
State the substrate first, because it decides which methods are available at all. Then state the run size, because it decides whether a multi-colour design is affordable. Then state where the pack will be sold & handled, because that sets the durability requirement.
- The substrate for each decorated surface: glass, coated glass, which plastic, or metal.
- The artwork as vector files, with a minimum line weight agreed for the method.
- The number of colours, & which of them are foil rather than ink.
- The colour standard for each mark, with the light source the match is judged under.
- The durability tests the decoration has to pass, with the method & cycle count.
- The run size for the first order, so the set-up cost is quoted honestly.
- Where the pack is handled & shipped, including the packing arrangement.
- Whether a physical limit sample will be agreed for acceptable variation.
Then agree how a reorder will be compared. The useful arrangement is a retained decorated pack kept as the reference, a colour check against the same standard under the same light, & a durability test repeated on reorders rather than only at first approval.
Where our capability fits
We qualify the decoration against the production substrate rather than against a similar one, & we run the adhesion & rub checks before the tooling is committed rather than after the first production run. Artwork is reviewed for line weight & registration against the method it will be printed with, colour is matched to a stated standard under a named light source, & a decorated golden sample is kept so that a reorder can be compared rather than argued about.
We work with brands on private label (your brand on a proven base), OEM/ODM contract manufacturing & full custom formula development, & the decoration route is settled with the pack rather than after it. Our lines include a golden amphora perfume spray, an amber clear teardrop oil capsule & a champagne gold face oil capsule, each produced with the same specification & retention discipline.
Tell us the pack material, the artwork you have & the run size you are planning, & we will come back with the method that will hold, the tests it has to pass & what the set-up means for your unit cost. 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. Labelling legibility, mandatory text placement, colour standards & the documentation each market expects vary by destination & by product, & the applicable position should be confirmed with the competent authority & a qualified professional before a pack is placed on sale.