The topic is short and compact
Transfer resistance is created by film-forming agents that form a cohesive film after the volatile phase has evaporated.
The higher the proportion of film, the better the hold and the worse the wearing comfort and ease of touch-ups.
Volatile carrier substances also evaporate inside the container, which is why tightness is a matter of function rather than comfort.
Long wear is not an additive, but a structure. After application, the volatile phase evaporates, and the remaining film-formers cross-link to form a coherent film that encloses the pigments and fixes them on the skin. Without this film, pigments lie loose and transfer upon contact.
This leads to the central target parameter: the film must be cohesive enough to bind pigments, and flexible enough to follow facial expressions without flaking. Achieving both simultaneously is the real development work.
Volatile phase: determines drying time and the window of time for blending.
Film-formers: determine transfer resistance and flexibility.
Pigment wetting: decides whether the color sits in the film or on top of it.
What technically creates long-lasting hold
Long wear is not an additive, but a structure. After application, the volatile phase evaporates, and the remaining film-formers cross-link to form a coherent film that encloses the pigments and fixes them on the skin. Without this film, pigments lie loose and transfer upon contact.
This leads to the central target parameter: the film must be cohesive enough to bind pigments, and flexible enough to follow facial expressions without flaking. Achieving both simultaneously is the real development work.
Volatile phase: determines drying time and the window of time for blending.
Film-formers: determine transfer resistance and flexibility.
Pigment wetting: decides whether the color sits in the film or on top of it.
The trade-off between support and comfort
Any increase in the film content improves hold and, at the same time, worsens comfort, touch-up capability, and removability. A product with maximum transfer resistance feels tight, can no longer be corrected, and requires an oil-based cleanser.
Therefore, the first question is not how much hold is possible, but how much hold the product promise actually needs. A lip tint can be tighter than a foundation that is worn all day and touched up in between.
Weigh wear time and touch-up capability against each other, do not demand the maximum of both.
Define removability early on; it is part of the product promise.
The product category determines the permissible level of tightness.
Pigment wetting as an underestimated lever
A common mistake is to control hold solely via the film former. It is equally crucial whether the pigments are fully wetted and embedded in the film. Incompletely dispersed pigments sit on top of the film instead of in it and transfer despite a high film volume.
Surface-treated pigments significantly improve wetting and allow the film content to be reduced without losing hold. This simultaneously improves comfort on the skin. The basics of dispersion are described in Shade development for make-up.
Use surface-treated pigments for better wetting.
Define dispersion time as a binding process parameter.
Always perform transfer tests on the dispersed sample, not on the formulation theory.
Verify instead of claiming
Transfer resistance is measurable and should not be discussed based on impressions. A standardized transfer test on defined material after a defined time and pressure force is customary, supplemented by application tests over the claimed duration.
It is important to test against a reference. A result without a comparison product says little because there is no scale. If a wear duration is claimed, Regulation 655/2013 requires proof on the finished product.
Transfer test with defined time, pressure force, and substrate.
Include a reference product in the test to have a scale.
Application test over the claimed wear duration.
Filling and tightness are functional
formulations with a high proportion of volatile carrier substances also lose them in the container if the packaging is not tight. The product thickens over its shelf life, the application changes, and the hold decreases, even though the formulation is unchanged.
Tightness is therefore not a convenience feature for these products, but part of the function. The filling process itself is equally critical: volatile systems evaporate during filling, which is why the headspace and filling temperature must be tightly controlled.
Tightness testing over the entire shelf life, not just initially.
Check material compatibility with volatile carrier substances.
Define headspace and filling temperature as process parameters.
From prototype to series production
During scale-up, energy input is the critical point. The pigment dispersion achieved in the laboratory must be reproducible on a production scale, otherwise the transfer resistance decreases despite an identical formulation. The peripheral speed of the agitator is decisive, not the speed.
As with every color cosmetics project, the following applies: dispersion time, temperature control, and filling parameters are defined and documented in the pilot batch. Details on this in Scaling cosmetic production.
Peripheral speed instead of rotational speed as a specification.
Pilot batch with at least ten percent of the series quantity.
Transfer test per batch as a release criterion.
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FAQ
What technically causes transfer resistance?
By film-forming agents that form a cohesive film after the volatile phase evaporates and enclose the pigments within it. Without this film, pigments lie loosely on the skin and transfer upon contact. A film that is cohesive enough for hold and flexible enough for facial expressions is crucial.
Why does long-wear makeup often feel tight?
Because hold and wear comfort directly counteract each other. Any increase in the proportion of film-forming agents improves transfer resistance but worsens wear comfort, reapplicability, and ease of removal. It makes sense to align the necessary hold with the product promise instead of maximizing it.
Can hold be improved without more film-forming agents?
Yes, via pigment wetting. Incompletely dispersed pigments sit on top of the film instead of inside it and transfer despite a high amount of film. Surface-treated pigments and a sufficient dispersion time make it possible to reduce the film content and still achieve hold.
How is transfer resistance tested?
Via a standardized imprint test on a defined substrate after a defined time and contact pressure, supplemented by application tests over the promised duration. A reference product in the same test is important because an individual result has no scale without comparison.
Why is the packaging functionally relevant for Long-Wear?
Because the volatile carrier substances also evaporate in the container if the packaging is not tight. The product thickens over its shelf life and the hold decreases, even though the formulation is unchanged. Tightness must therefore be tested over the entire shelf life.
What is most critical during scale-up?
The energy input during dispersing. On a production scale, it is lower per volume than in the laboratory, which means the pigment dispersion remains incomplete and the transfer resistance decreases. The peripheral speed of the agitator must be specified, not the speed.
