Strong acid bath · full shades
Acid range
Yellow to black across Brill. Yellow 2G, Scarlet B, Violet 4BNS and Nigrosine. Levels well under a strong acid bath, dyeing depth up to 4.0% owf on the blacks.
Textile Chemistry · Acid Dyes
Acid dyes forwool, silk and nylon.
Dragonacid dyes bond to the amino groups in wool, silk and nylon under an acid bath. Two ranges, acid and weak acid, from Brill. Yellow 2G to the depth blacks, each shade with its C.I. Acid number, dyeing depth and fastness data.
90+ shadesyellow to black on wool
2 acid strengthsacid · weak acid
ISO 9001 · 14001certified group
30+ countriesserved since 1992
Product detail
Two acid strengths, one wool shade card.
The Dragonacid brochure lists every shade at 100 to 400% strength on wool, with C.I. Acid number where it applies, dyeing depth in % owf, fastness to light (xenon), washing at 40°C, perspiration and hot pressing.
Mild bath · steadier wet fastness
Weak acid range
A parallel yellow-to-black card, from Yellow TB to Black NB-G, dyed closer to neutral pH. Trades some levelling power for steadier wet fastness, most washing figures 4 to 5.
Where it goes
Wool, silk and nylon, matched to the bath.
- Wool and silk exhaust dyeing, acid range for full shades under a strong acid bath
- Nylon dyeing with either range, chosen by the fastness target
- Weak acid range where wash fastness matters more than levelling
- Full C.I. Acid number and fastness data per shade for recipe planning
Before you order
Straight answers for the technical buyer.
01What are acid dyes?
Water-soluble anionic dyes that bond ionically with the amino groups in protein and polyamide fibers: wool, silk and nylon. Dragonacid runs a standard acid range and a weak acid range, each shade with its C.I. Acid number and fastness data in the brochure.
02What are acid dyes used for?
Wool sweaters and carpets, silk fabric, and nylon yarn and hosiery. Dragonacid indexes every shade by C.I. Acid number, from Brill. Yellow 2G to the depth blacks Nigrosine and Black NB-G.
03Do acid dyes work on cotton?
No. Cotton has no amino groups for the dye to bond to, so an acid dye will not fix on it. Acid dyes need wool, silk or nylon; for cotton, Hongda's Dragondirect and Dragonfix ranges cover direct and reactive dyeing.
04What is the difference between acid dyes and weak acid dyes?
Strong acid dyes level well in a strong acid bath, formic acid at low pH, but give up some wet fastness. Weak acid dyes dye closer to neutral, acetic acid, and hold better washing fastness with less levelling power. Dragonacid carries a full yellow-to-black card in both, so you choose by the trade-off your article needs.
05How do acid dyes work?
The dye's anion pairs with the protonated amino groups on wool, silk or nylon under an acid bath, an ionic bond that forms as the pH drops. Formic acid pushes it further for the acid range; a milder acetic acid bath suits the weak acid range. The brochure lists dyeing depth and fastness per shade so you can match strength to bath.
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