Dyestuff Knowledge Center

For a nylon-cotton blend, the honest answer is usually both — not one or the other. Reactive dyes fix onto the cotton portion. Acid dyes fix onto the nylon portion. The two are run as a combined or sequential bath. Specify only one class and you almost always end up with one fiber pale, chalky, or off-shade against the other. If you're a trader quoting a nylon-cotton order, or a buying house reviewing a supplier's recipe, the real decision isn't "acid or reactive." It's which

A trial lot comes back perfect. CMC ΔE under 0.5, the dye house is happy, the sample is approved. Three container loads later, the same recipe is drifting half a shade warmer, and now you're the one fielding the call asking what changed. Nothing changed on the dye house floor. Something changed at the supplier's end — a raw material lot, a drying batch, a strength variance nobody flagged. If you trade or buy reactive dyes for cotton, you've had this conversation, or you will.

Every season, millions of metres of jet-black cotton fabric move from dye houses in Tiruppur, Dhaka, and Ho Chi Minh City into garments that end up on shelves in Milan, Madrid, and São Paulo. The dye sitting at the centre of most of those supply chains is Reactive Black 5 (Reactive Black B) — a molecule so well-suited to cellulosic fibres that it has remained the dominant commercial black reactive dye for over four decades. Yet buyers who purchase it regularly — traders, buyi

If you work in textiles, leather, or paper manufacturing, the question is never simply "which colour?" — it is always "which dye chemistry, and why?" The wrong choice of dyestuff costs you in re-dyeing, poor fastness, customer returns, and failed quality audits. The right choice — matched precisely to your fiber, your process, and your end-use requirements — delivers consistent results, batch after batch, across every market you serve. At Avi Chemicals, we have been manufactu

Every textile mill has had that moment — a batch comes out of the dyeing vessel looking wrong. The shade is patchy, the color breaks on wash testing, or the fabric itself feels compromised. Nine times out of ten, the root cause is not the process. It is the dye selection. Choosing the wrong dye class for a fiber does not just produce poor color. It drives up re-dyeing costs, triggers quality rejections, and creates delivery delays that ripple through the entire supply chain.