Textile Glossary · Process · Surface Treatment
Mercerisation
/ˌmɜːsəraɪˈzeɪʃən/
Mercerisation is a chemical treatment that permanently alters cotton fibre structure, increasing lustre, strength, and dye affinity — without adding any synthetic material.
Understanding the Term
What mercerisation actually does to cotton.
Invented by John Mercer in 1844, mercerisation treats cotton yarn or fabric with sodium hydroxide under tension. The alkaline bath swells the cellulose fibres, changing their cross-section from kidney-shaped to nearly circular. This structural change is permanent.
The circular cross-section reflects light more uniformly, producing a subtle sheen that looks nothing like synthetic gloss. It's the same difference between polished marble and plastic laminate — both shine, but one earns it.
Beyond appearance, mercerisation increases tensile strength by 15–20% and improves dye uptake significantly. Colours become deeper, more saturated, and more resistant to fading. The process effectively upgrades the cotton at a molecular level.
Why It Matters
How mercerisation transforms your t-shirt.
The invisible upgrade most brands skip.
01
Natural Lustre
Mercerised cotton has a subtle, silk-like sheen that's permanent — it won't wash out. Unmercerised cotton looks comparatively flat and matte, even when new.
02
Deeper Colour
The swollen fibres absorb more dye, producing richer, more vibrant colours that resist fading. Our blacks stay black. Our navys stay deep.
03
Added Strength
The structural change adds 15–20% tensile strength. This means less pilling, less stretching at the neckline, and a garment that holds its shape wash after wash.
Our Standard
Every metre of our fabric is mercerised.
We mercerize after knitting, not before. This ensures the treatment penetrates the finished fabric structure rather than just individual yarns. It costs more and takes longer, but the result is a uniform sheen across the entire garment — not just thread-deep.
100%
Mercerised
Every batch, every colour, no exceptions
Related Terms
Explore more textile terminology.
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Common Questions
Mercerisation — your questions, answered.
Common questions about this finishing process.
No. Mercerised cotton has a subtle sheen, but it's still 100% cotton. It feels softer and looks more refined than untreated cotton, but the hand feel and breathability are distinctly cotton.
See It in Practice
Mercerised Supima cotton.
The sheen speaks for itself.
Photography can't capture the lustre. You have to see it in person.
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