Acid Red 14

Acid Red 14 is an acid-class azo dye supplied as a water-soluble salt. It is predominantly used for dyeing and printing acid-dyeable fibers such as wool, silk and polyamide (nylon) and is valued for its bright red shades, predictable leveling behavior and reliable bath exhaustion under acidic conditions.

TRADE NAME:

Acid Red B,Carmine B,Carmoisine

Key properties

Chemical class: Azo acid dye, supplied as a water-soluble salt.
Application: Designed for acid-dyed and protein fibers — wool, silk — and acid-dyeable polyamides (nylon).
Shade: Bright, vivid red with good tinting strength for blends and blends correction.
Solubility: High water solubility in acidic baths; easy to prepare stable dye baths.
Exhaustion: Good exhaustion and uptake on protein fibers when applied under recommended acidic conditions.
Leveling: Predictable leveling and uniformity when proper auxiliaries and dosing procedures are used.
Fastness profile: Generally good wet-fastness; lightfastness is moderate and can be improved with finishing treatments.
Compatibility: Compatible with common acid dye auxiliaries and leveling agents; not suitable as a pigment without fixation.
pH sensitivity: Dye uptake and shade depend strongly on bath pH — optimal performance in weakly to moderately acidic baths.
Handling & safety: Handle with standard PPE; avoid uncontrolled discharge to wastewater; follow local regulations for disposal.

Application of Acid Red 14:

The Barium salt can be used as organic pigment use. Also can be used in the manufacture color amylum, ink and used for leather, paper, soap, wood, electrical-controlled silver, medicine, biology and cosmetics shading.

Use condition:

‍1. It is mainly used for dyeing wool in strong acid dyeing bath. It can be printed on wool, nylon and silk fabric. Its strontium salt can be used as organic pigment. It can also be used in the manufacture of lake, ink and leather, paper, soap, Coloring of wood, anodized aluminum, medical organisms and cosmetics.
2. Wool dyeing is carried out in a strong acid bath, the pH value of the dyeing solution is adjusted to 2~4, and the Canadian dollar powder is used as a retarding agent. The highest dyeing temperature when using acetic acid as the dyeing agent is 95~100 °C; It is carried out in an acetic acid bath. When the wool is dyed in the same bath as the various fibers, the apparent color depth of the nylon is similar to that of the wool, the silk is slightly shallow, and the cellulose fibers are not stained.
3. It is discolored by the influence of metal salt during dyeing, so this dye is generally not used as the main dye when dyeing red.

Technical Specifications

‍CAS NO: 3567-69-9
CI.NO: 14720
Molecular Formula: C20H12N2Na2O7S2
Molecular Weight: 502.43
Shade:Blue-ray red‍

Standard	Fiber	Soaping		Persperation Fastness	Oxygen bleaching	Light Fastness
Standard	Fiber	Fading	Stain	Persperation Fastness	Oxygen bleaching	Light Fastness
AATCC	Wool	3	3	2-3	1	3
ISO	Wool	2	5	3	1	3

Leveling(grade)

Displacement

Whitening

Solubility(g/L)

Metal ion effect(grade)

copper

iron

chromium

3~4

Good

200(100℃)

1~2

Colour Fastness Test

Test Methods	fiber	Alkali resistance	Carbonization	Chlorination discoloration	Oxygen bleaching	Alkali fluff		Acid fluff		potting		soaping		Perspiration	Sun exposure
Test Methods	fiber	Alkali resistance	Carbonization	Chlorination discoloration	Oxygen bleaching	discolor	Staining	discolor	Staining	discolor	Staining	discolor	Staining	Perspiration	Sun exposure
AATCC	wool	2	4	1	1	2~3	2~3	—	—	—	—	3	3	2~3	3
ISO	wool	3	4	1	1	1	4	3	2	1	1	2	5	3	3

What fibers are best dyed with Acid Red 14?

Acid Red 14 is optimized for protein fibers (wool, silk) and acid-dyeable polyamides such as nylon. It performs poorly on purely synthetic non-polar fibers unless special carriers or mordants are used.

What pH and bath conditions give the best exhaustion?

Acid dyes like Acid Red 14 typically give best uptake in an acidic bath. Aim for a weakly to moderately acidic pH (often around pH 3–5) and follow controlled temperature rise and dye addition to avoid streaking. Always run trials on your substrate and scale conditions to your equipment.

Is Acid Red 14 suitable for printing (paste) systems or only for exhaust dyeing?

Acid Red 14 can be formulated into printing pastes for wool and silk, but printing requires suitable binders and acidic fixation systems. For paste printing on nylon, ensure the paste pH and fixation step are compatible with the dye chemistry to secure acceptable fastness.

What auxiliaries are typically used with Acid Red 14?

Common auxiliaries include acid buffers to control bath pH, leveIing agents to improve uniformity, dispersing agents to reduce specking at higher concentrations, and mild oxidizing or fixing aids when recommended by the auxiliary supplier. Always verify compatibility on a lab scale.

How should Acid Red 14 be stored and handled?

Store in a cool, dry place in tightly sealed containers away from direct sunlight and incompatible materials. Use appropriate PPE when handling powders or concentrated solutions, avoid inhalation and skin contact, and follow your facility’s safety data sheet (SDS) instructions.