Coloured Reflective Fabric: How Bright It Can Actually Get

Coloured reflective is usually the second question a buyer asks, after the swatch book has been opened and a colour has been picked. The first question is how bright it is. The honest answer is a number, and the number is much lower than the one on the silver page next to it — not because the material is badly made, but because colour and retroreflection compete for the same light.

This article sets out what directly pigmented colour measures, why that figure cannot reach a high-visibility claim, and what to ask a supplier before specifying coloured trim into a programme. It is written for buyers and product developers, not for consumers choosing a decorative strip.

What the Number Actually Describes

Retroreflective performance is quoted as a coefficient of retroreflection, written cd/(lx·m²). It describes how much light comes back towards the source per unit of illumination falling on the material, per unit of area.

That figure is only meaningful together with three things:

• The measurement geometry. A retroreflection reading is taken at defined entrance and observation angles, and the value changes with them. A number without its geometry cannot be compared with another supplier's number.
• The conditioning. Readings are taken before and after defined exposure, and after washing. Fresh-from-the-roll and after-twenty-five-washes are different figures for the same material.
• The specimen. Which grade, which construction, which colour. A range leaflet often quotes the best grade in the range, not the one you are buying.

This is why a datasheet that gives a single number, with no geometry, conditioning or grade, is not usable for a specification decision.

Why Colour Costs Return Light

A retroreflective material works by sending light back along the path it arrived on. In a glass-bead or microprismatic construction, that light passes through the coloured layer twice — once on the way in, once on the way out.

Pigment does not pass the whole spectrum. It absorbs part of it and reflects the rest, and the part it reflects is what you see as the colour by day. The colour you are looking at is, quite literally, the light that did not make it back through the return path.

The practical consequence is directional: the more saturated the colour, the more of the return path is filtered, and the lower the coefficient. A white or silver face has almost nothing filtering it. A deep colour has a great deal.

What Directly Pigmented Colour Measures

In our own colour range, where the colour is pigmented into the construction directly rather than applied over a metallic face, the measured coefficient sits at 60–70 cd/(lx·m²).

Three things about that figure matter more than the figure itself:

• Read it as a range, not a specification. Colour builds vary from batch to batch. Quoting a single number would be a claim we could not hold across deliveries, and a buyer comparing it against a tight specification would be misled.
• Some builds are lower. Standard colour constructions outside that band measure only a few cd/(lx·m²). Colour name alone does not tell you which band you are in — the measured figure does.
• It carries a test basis. Most grades in the colour range are tested to ISO 6330 at 60 °C for 25 washes. Confirm the basis for the specific grade you order, because a wash figure is only meaningful with its cycle.

Why That Cannot Reach the 330 Figure

In our own grading, a material needs to reach 330 cd/(lx·m²) before it can support an EN ISO 20471 claim. Directly pigmented colour at 60–70 is roughly a fifth of that, and the lower colour builds are further away again.

This is not a quality problem to be solved by specifying harder. The coefficient is set by how much light survives the return path, and colour absorbs inside that path by definition. A denser pigment load makes the colour stronger and the return dimmer, not brighter.

There is a second reason the question is often framed wrongly. EN ISO 20471 applies to the finished garment — the visible area, the arrangement of the trim, and the performance of the assembly after care. A material figure is an input to that assessment, not a certificate for it. So the useful question is not "is this tape certified" but "what measured coefficient does this material deliver, on what basis, and does the garment built from it reach the class the risk assessment calls for".

The Percentage You Will See Quoted Is Not This Number

Colour is often described in percentages — "reflects about 25% of white", or similar. Treat that with care. A ratio against another material is a different quantity from the coefficient of retroreflection, and it does not tell you whether your material clears a threshold.

Two materials can be 25% of each other in one measurement setup and a different fraction apart in another, because the ratio moves with geometry and conditioning just as the absolute figure does. Only a coefficient in cd/(lx·m²), with its geometry and conditioning stated, can be checked against a specification.

What Colour Is Right For

Coloured reflective is a design material. It is the right choice where the reflective element has to carry brand or product identity rather than satisfy a visibility standard:

• design-led trims on consumer apparel and accessories;
• branding and logo applications;
• footwear, bags and equipment detailing;
• promotional and event pieces.

It is the wrong choice where the trim is the safety element — workwear specified by a safety manager, garments that will be marked under EN ISO 20471 or ANSI/ISEA 107, or anything where the reflective material has to survive an assessment against a class. In those programmes the material decision is made by the required coefficient, and colour is chosen afterwards within what qualifies.

What to Ask a Supplier of Coloured Trim

• The measured coefficient, with geometry and conditioning. Without those, the number is not comparable.
• The figure for your grade, not the best grade. Ask explicitly whether the quoted value applies to the colour and construction you are ordering.
• Batch variation. Ask how much the figure moves between batches, since that is what your quality file has to live with.
• The wash cycle actually run. Domestic and industrial laundering are different tests, and the cycle is part of the number.
• A sample on your material. Colour reads differently against different backgrounds, and a swatch is the only way to judge the daylight appearance before committing.

Frequently Asked Questions

Can coloured reflective fabric be certified to EN ISO 20471?

Not at the figures directly pigmented colour reaches. At 60–70 cd/(lx·m²) the material is well below the 330 level our grading requires before a 20471 claim can be supported, so a garment built around it cannot carry that claim on the trim's performance. The standard is also assessed on the finished garment, not on a roll of material.

How bright is coloured reflective fabric compared with silver?

Substantially dimmer, by construction rather than by defect. Directly pigmented colour measures 60–70 cd/(lx·m²); some standard colour builds measure only a few. Silver faces carry almost no pigment in the return path, which is why they reach figures an order of magnitude higher.

Does the colour fade or lose performance in the wash?

Most grades in the colour range are tested to ISO 6330 at 60 °C for 25 washes, and the performance figure you should specify is the post-wash one. Confirm the cycle for your specific grade, and state the laundering regime you actually run — domestic and industrial cycles are not interchangeable.

Where is coloured reflective actually used?

Where the reflective element is a design feature: branded trims, consumer apparel and accessories, footwear and bag detailing, and promotional pieces. It is not used as the safety element on garments assessed against a high-visibility class.

What should be in the specification?

The measured coefficient with its geometry and conditioning, the grade and colour it applies to, the wash cycle and the post-wash figure, and the batch variation. A single number with none of that context cannot be checked when the goods arrive.

Request Coloured Swatches

Colour decisions are made on physical swatches, not on screen. A4 swatches from the colour range are free so your team can check the daylight appearance and the hand feel against the garment it will sit on, and we will quote the measured figure for the specific grade you are evaluating.

Start from the colour reflective fabric page for the full range, or go straight to white, black, fluoro orange and fluoro yellow. The colour collection lists every grade in one place, and the reflective materials overview covers the rest of the range.

If the programme turns out to need a high-visibility claim, the starting point is what EN ISO 20471 requires of reflective tape; if you are still deciding how to read suppliers' numbers, read how to read a reflective datasheet. Either way, send the requirement through the contact form and we will come back with something executable.

Sources and Scope

1. EN ISO 20471, High visibility clothing — Test methods and requirements — available from ISO and national standards bodies via ISO 20471. Read the current edition for the area tables, angular values and conditioning sequences that apply to the finished garment.
2. ISO 6330, Textiles — Domestic washing and drying procedures for textile testing — the domestic wash basis cited above. Industrial laundering is a separate regime and is not covered by this standard.
3. CIE 54.2, Retroreflection: Definition and Measurement — Commission Internationale de l'Eclairage. Defines the coefficient of retroreflection and the geometry under which it is measured, which is why a figure is only comparable when its geometry is stated.

This article is a procurement guide, not a substitute for the standard text, a workplace risk assessment, or the certificate issued for your specific garment. The coefficient of 60–70 cd/(lx·m²) quoted above is the range we measure for our own directly pigmented colour constructions and applies to those products only; individual grades and batches vary within and below that band. Garment conformity is established on the finished product by the entity placing it on the market.