Bleaching Contractors

Bleaching does two quite different jobs in the apparel industry, and bleaching contractors usually do both. The first is preparation: removing the natural color, seed fragments and impurities from cotton fabric or garments so the cloth is a clean, even white ready for dyeing or sale as white goods. The second is fashion: bleach washing denim and colored garments down through graduated shades, from a gentle rinse of color to the palest ice blue, as a style effect in its own right.

This page explains the main bleaching methods a contractor uses, how fashion bleach effects are controlled, the damage and effluent issues that have to be managed, and how to specify bleaching work. The listings below are contractors and processors that offer bleaching among their garment services.

Preparation Bleaching and Fashion Bleaching

Preparation bleaching is normally done with hydrogen peroxide in an alkaline bath, after scouring has removed waxes and pectins from the cotton. Peroxide bleaching whitens evenly, leaves the fabric absorbent for dyeing, and breaks down to water and oxygen, which is why it dominates modern preparation lines. Hypochlorite bleaching is faster and cheaper but harsher, and it survives mainly in fashion work where its aggressiveness is the point.

Fashion bleaching of garments — the bleach wash — uses sodium hypochlorite (or permanganate sprays for localized effects) to strip dye from finished jeans and garments. The contractor controls the final shade through bleach concentration, temperature and time, pulling the load through a series of shade approvals. A full bleach can take indigo denim almost to white; a light bleach gives the soft, sun-faded cast that premium denim lines use as a base for further hand finishing.

Controlling Damage and Effluent

Every bleach that removes color also attacks cellulose, so strength loss is the standing risk. Contractors manage it by keeping baths at the mildest effective strength, adding stabilizers to peroxide systems, watching time and temperature closely, and testing tensile strength on finished lots. Chlorine systems add a second obligation: residual bleach must be neutralized with an anti-chlor rinse, or garments yellow and weaken in storage and the first customer wash smells of chlorine.

Effluent rules shape the chemistry a laundry can offer. Hypochlorite discharge is restricted in many jurisdictions because of chlorinated by-products, which is one reason laundries have shifted fashion work toward peroxide, ozone and permanganate techniques where the style allows. When comparing contractors, ask which bleach systems they run and how their discharge is treated — the answer tells you a lot about the plant.

Specifying Bleaching Work

Give the contractor a shade target, not a recipe. For preparation work, specify the whiteness level and absorbency your dyeing needs; for fashion work, supply an approved shade garment or a recognized shade standard and agree an acceptable range, because a drum load never bleaches perfectly uniformly. Trial loads on your actual fabric are essential: the same bath that gently fades one denim can streak another with different indigo penetration.

The bleaching contractors below include full-service garment wet processors that combine bleaching with washing, dyeing and other finishes, which suits brands that want one plant to take a garment from greige or rigid denim to a finished, shelf-ready shade.

Bleaching Contractor Listings

Contractors and processors offering bleaching for garments and textiles.