Enzyme Wash

Enzyme washing is a garment finishing technique that uses biological enzymes — proteins that catalyse chemical reactions — to modify the surface structure of fabric. The process selectively degrades cellulose surface fibres (on cotton and similar natural fibres), removing the outermost layer to create a cleaner surface, improved softness, and a characteristic vintage appearance.

The Science of Enzyme Washing

Cellulase enzymes, derived from fungi like *Trichoderma reesei*, are the primary enzymes used in textile finishing. When applied to cotton fabric or garments in an aqueous bath, cellulases attack and hydrolyse the cellulose chains on protruding surface fibres, breaking them down and allowing them to be washed away. The result is:

• Reduced pilling tendency (surface fibres that cause pills are removed)
• Improved smoothness and lustre
• Enhanced colour brightness due to removal of surface fuzz that scatters light
• A soft, supple hand feel often described as "peach skin" on fine fabrics

Types of Enzyme Washes

• Biopolishing/Bio-finishing: A controlled enzyme treatment primarily for smoothness and anti-pilling. Used on T-shirts, jerseys, and casual wear to improve hand feel without significant colour change
• Bio-stoning: Enzyme washing of denim as an alternative to traditional stone washing. Enzymes partially replace pumice stones, reducing fabric and machine damage while achieving a similar worn look
• Acid enzyme wash: Uses cellulases under slightly acidic pH conditions (4.5–5.5), producing more aggressive surface degradation and a more pronounced faded effect
• Neutral enzyme wash: Milder process at neutral pH (6–7), more gentle on fabric, used for delicate finished looks

Process Parameters

The enzyme wash is conducted in industrial washing machines or paddle dyeing machines at:

• Temperature: 45–60°C (enzyme activity is temperature-sensitive; too high denatures the enzyme)
• pH: 4.5–7 depending on enzyme type
• Time: 30–90 minutes
• Enzyme concentration: 0.5–3% on weight of fabric (OWF)

After enzyme treatment, the bath is heated to 80–90°C to inactivate ("kill") the enzymes and stop the reaction, then garments are rinsed and finished.

Enzyme washing services are widely available in India's garment processing hubs:

Tirupur, Tamil Nadu:

• The primary destination for enzyme washing on knitwear. Most medium-to-large dyeing and finishing units in Tirupur offer enzyme biopolishing and bio-stoning as standard services
• Look for units with GOTS certification if your brand has sustainability claims — GOTS permits certain enzyme types and requires enzyme inactivation protocols

Ahmedabad, Gujarat:

• Strong for denim processing including enzyme washing. Several large finishing units serve both domestic and export markets

Bangalore (Bommasandra, Peenya):

• Some export-focused garment factories have in-house enzyme washing for woven and knit garments

Sourcing enzyme chemicals:

• Major enzyme suppliers active in India: Novozymes (Danish, major global supplier), AB Enzymes, and several Indian generic enzyme manufacturers
• Available through textile chemical distributors in Tirupur, Surat, and Ahmedabad

Questions to ask a finishing house:

1. Which enzyme type and supplier do you use?
2. Do you have temperature and pH control monitoring on your machines?
3. Can you share tensile strength test data for treated fabric?
4. Do you inactivate enzymes after treatment (important for fabric integrity)?
5. What is your minimum batch size for enzyme washing?

Enzyme wash pricing in India varies by process type and lot size:

Enzyme biopolishing (anti-pilling, softness):

• ₹30–₹80 per kg of garment weight | USD 0.36–0.96/kg
• Per T-shirt (~200g): ₹6–₹16 | USD 0.07–0.19

Bio-stoning on denim (enzyme + stone combination):

• ₹100–₹200 per kg | USD 1.20–2.40
• Per denim trouser (~600–800g): ₹60–₹160 | USD 0.72–1.92

Enzyme wash + dyeing combined (full programme):

• ₹200–₹400 per kg | USD 2.40–4.80 (significant savings vs. separate processes)

Acid enzyme wash (pronounced vintage effect):

• ₹80–₹150 per kg | USD 0.96–1.80

Setup and development costs:

• Wash recipe development (first-time finish): ₹500–₹2,000 one-time charge
• Lab sample approval: Usually 1–2 rounds included in development fee

Comparison to stone washing:

Enzyme washing is typically 20–40% cheaper than traditional stone washing because it uses less water, causes less machine wear, and has lower labour costs (no loading/unloading of stones). It also produces less fabric damage, reducing seconds rates.

Minimum viable lot: Most Tirupur units work with minimum 30–50 kg enzyme wash lots, making it accessible from approximately 150–250 T-shirts per run.