Why Do Scrubs Fade? Fabric, Dye, Washing and Colourfastness

Scrubs fade because frequent hot washing, strong detergents, bleach, sunlight and abrasion slowly strip or break down dye, and some fibre and dye combinations resist this better than others. Polyester-rich fabrics generally hold colour better than high-cotton fabrics, and dark shades show fading sooner than mid-tones. You can't stop fading completely, but you can slow it by choosing the right fabric, asking for colourfastness test results and adjusting how scrubs are washed and dried.

This article looks at why colour is lost and how to specify colourfastness when you buy. For step-by-step laundering advice, see how to wash scrubs.

What fading actually is

Fading is not one thing. Several different processes can make a uniform look tired:

• Dye loss in the wash. Some dye washes out over repeated cycles, especially at high temperatures and with alkaline detergents.
• Chemical bleaching. Chlorine bleach, and splashes of some disinfectants, can strip colour quickly, sometimes in patches.
• Light fading. Ultraviolet and visible light break down dye molecules. Drying scrubs in strong sun speeds this up.
• Surface wear. Abrasion breaks fibre ends on the surface. Fuzz and pills scatter light, so the fabric looks paler or "frosted" even if the dye is still there.

Knowing which one you are seeing helps you fix it. Even, all-over lightening points to washing. Patchy spots point to chemicals. A pale, fuzzy look at the knees, cuffs and seat points to abrasion. Pale shoulders and backs on garments dried outdoors point to light.

Fibre and dye: why some fabrics hold colour better

Different fibres are dyed with different dye classes, and they behave differently.

Fibre	Typical behaviour	What it means for scrubs
Polyester	Dye is locked inside the fibre; generally good wash fastness	Polyester-rich blends tend to keep colour well through hot washing
Cotton	Dye bonds to the fibre surface; can lose depth with repeated hot, alkaline washes	High-cotton scrubs may fade faster, especially in dark shades
Viscose/rayon	Takes dye brightly; softer fibre can wear and fade sooner	Comfortable, but check fastness results
Elastane (in stretch blends)	Small percentage; can be affected by heat and chlorine	Affects stretch more than colour, but avoid chlorine

In a poly-cotton blend the two fibres are usually dyed separately, so if the cotton component fades, the fabric can look slightly uneven or heathered. This is one reason poly-cotton with a higher polyester share is a common choice for scrubs that are washed hot several times a week.

Shade matters too. Navy, black, wine and deep teal show any loss of colour clearly. Mid-tones such as ceil blue and grey hide gradual fading better.

UAE factors that speed up fading

Some conditions in UAE clinics make fading more likely:

• Hot washing. Many clinics follow infection-control advice to wash scrubs hot. Higher temperatures generally increase dye loss.
• Strong sun. Drying on a balcony or rooftop in summer exposes dark fabric to intense UV. Even a few hours a week adds up.
• Hard water and heavy detergent. Mineral deposits and detergent residue can dull colours and leave a greyish cast, which looks like fading.
• Frequent washing. Staff with only two or three sets wash each set more often, which shortens colour life.

None of these are reasons to compromise on hygiene. They are reasons to choose fabric with good fastness and to manage drying and detergent sensibly.

How colourfastness is tested

Colourfastness is measured with standard laboratory tests, so you can ask a supplier for results rather than relying on descriptions such as "fade-resistant".

Fastness to washing

ISO 105-C06 is the international test for colour fastness to domestic and commercial laundering using a reference detergent. It includes single tests, intended to approximate one laundering, and multiple tests, which are more severe because of increased mechanical action. Results are judged on two grey scales: one for colour change of the fabric (ISO 105-A02) and one for staining of adjacent fabrics (ISO 105-A03). Grey scale ratings run from 1 to 5, with 5 meaning no visible change and half-steps in between.

In the United States, AATCC 61 is a comparable accelerated laundering test, partly equivalent to ISO 105-C06. Either is a reasonable basis for comparing fabrics, as long as quotes use the same method.

The ISO method notes that it does not reflect the effect of optical brighteners present in commercial detergents, which is worth remembering if your laundry uses them.

Fastness to light

ISO 105-B02 tests colour fastness to artificial light using a xenon arc lamp representative of daylight. Fabric is exposed alongside blue wool reference samples that fade at known rates, and the result is expressed against that blue wool scale. Light fastness matters for scrubs dried outdoors and for garments stored in sunny staff rooms.

Other tests to know about

Suppliers may also quote fastness to rubbing (crocking), perspiration or chlorinated water. For scrubs, washing and light are the essentials, with rubbing a useful extra for dark shades that might mark lighter garments or upholstery.

Specifying colourfastness when you buy

You do not need to set laboratory targets yourself, but you should ask the right questions and compare like with like.

1. Ask for fastness test reports for the fabric, naming the test method (for example ISO 105-C06 or AATCC 61, and ISO 105-B02).
2. Check which test variant was used. A gentle single-wash test and a harsh multiple-wash test are not comparable.
3. Look at both colour change and staining ratings. Staining matters if scrubs are washed with other items.
4. Compare quotes on the same basis. If one supplier gives ISO results and another gives none, ask for them before deciding.
5. Run your own wash test on a sample: wash it alongside your normal laundry ten or more times and compare it with an unwashed piece kept in the dark. Doing this before bulk production avoids surprises.

If you are writing a formal specification, put the required test methods in writing so every bidder answers the same question.

Slowing fading day to day

The laundering basics, in short:

• Turn scrubs inside out before washing to reduce surface abrasion on the visible face.
• Wash dark colours together and avoid overloading the machine.
• Avoid chlorine bleach on coloured scrubs unless the fabric is specified for it.
• Use the right amount of detergent; too much leaves residue that dulls colour.
• Dry in the shade or indoors rather than in direct sun, and avoid over-drying in a tumble dryer.
• Rotate sets so each one is washed less often; see how long scrubs last for replacement planning.

Always follow your facility's infection-control guidance on temperature. If the policy requires hot washing, choose fabric that can take it rather than lowering the temperature.

When faded scrubs meet new ones

Fading becomes a visible problem when a new batch arrives and sits next to well-worn sets. Rather than trying to match faded garments, keep an unworn reference and replace sets by team or role. Our guide to keeping colour consistent on reorders covers this in detail.

Fabric choices for longer-lasting colour

MISHAREN makes medical scrubs to order at its own unit in Konni, Kerala, India, in poly-cotton for frequent hot washing and in polyester-viscose-elastane stretch for long shifts, in navy, ceil blue, teal, wine, grey, black and more. If colour retention matters for your team, tell us how your scrubs are washed and ask about fabric options and test documentation when you request a quotation through our contact page.