Acid Dyes

Acid Black 52 Manufacturer in India

Trade Name: ACID BLACK /EB  ·  CI Number: Acid Black 52

Manufacturer: Yobai Industries, Sayakha, Gujarat MOQ: 10 kg Samples: 24 hours Export: Worldwide GST Registered
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Overview

Acid Black 52 — Product Overview

Acid Black 52 is a disazo milling acid dye that produces a neutral, cool black on wool, nylon, and leather. As a milling-class dye, it bonds more tenaciously to protein and polyamide fibres than conventional levelling blacks, delivering wash fastness of 4–5 — a full grade higher than levelling blacks typically achieve.

The dye exhausts at a moderate pH of 4–6 using acetic acid or ammonium sulphate, which makes it gentler on sensitive wool and silk fibres and on chrome-tanned leather compared to pH 2–4 levelling blacks. This makes Acid Black 52 the preferred choice for soft-handle knitwear, merino wool fabrics, and premium shoe uppers where both fibre integrity and depth of black are equally important.

In production dyeing, the dye is applied using standard exhaust methods — jigger, overflow jet, and beam dyeing for fabric; rotary drum for leather. It is often used alongside Acid Red 114 or Acid Blue 113 for shade correction — fine-tuning the warmth or coolness of the final black. Yobai Industries supplies Acid Black 52 as ACID BLACK /EB, quality-tested against reference standards before every batch is dispatched.

Applications

  • Wool dyeing
  • Nylon and polyamide dyeing
  • Leather colouring
  • Shoe upper leather finishing
Substrates

Suitable For

  • Wool
  • Nylon
  • Leather
Benefits

Key Benefits

  • Neutral to slightly acidic dyeing conditions
  • Good levelness on nylon and wool
  • Better wash fastness than Acid Black 1 in some applications
  • Good compatibility with other acid dyes for shading
  • Suitable for both exhaust and pad dyeing
Technical Specifications

Acid Black 52 — Technical Specifications

Specifications are indicative. Contact us for a batch-specific TDS before placing a bulk order.

ParameterValue
Product NameAcid Black 52
Trade NameACID BLACK /EB
CI NumberAcid Black 52
CAS Number5610-64-0
ColourBlack
AppearanceBlack Powder
Ionic CharacterAnionic
SolubilitySoluble in hot water.
Molecular Weight~690 g/mol
Dye ClassAcid Dye
Sub-classMilling Acid Dye
Application pH4–6
Application Temp.85–95°C
Required AuxiliariesAcetic acid to pH 4–6; sodium sulphate (10–20 g/L) as levelling agent
Wash Fastness4–5
Light Fastness4–5
Packaging1 kg · 5 kg · 10 kg · 25 kg · 50 kg · Custom packaging available
Shelf Life5 years from manufacture (cool, dry, sealed storage)
ManufacturerYobai Industries, Sayakha, Gujarat, India
GSTINGST Registered

Need a full TDS, COA, or MSDS? Request it here or WhatsApp us directly.

Chemical Properties

Chemical & Physical Properties

Dye Identification

CI Generic NameAcid Black 52
Trade NameACID BLACK /EB
Dye ClassMilling Acid Dye
Ionic CharacterAnionic (sulfonated)
CAS Number5610-64-0
Molecular Weight~690 g/mol

Physical Characteristics

AppearanceBlack powder
Solubility (20°C)20–30 g/L in water
Solubility (60°C)Fully soluble
Moisture Content≤ 6%
Dye Strength100% (standardised)
Solution pH (1%)6.0 – 7.5

Recommended Dosage — Exhaust Process (Wool / Nylon)

Indicative dosages at liquor ratio 1:15–1:20. Add dye dissolved in warm water first, then add acid separately to achieve target pH. Carry out lab trials before bulk production.

Shade Depth % owf Acetic Acid Na₂SO₄ (g/L) Temp. (°C) Time at Temp.
Light Charcoal 0.5 – 1.0 To pH 5–6 10 – 15 85 30 min
Medium Grey-Black 1.0 – 2.0 To pH 4.5–5.5 15 – 20 88 – 90 45 min
Deep Black 2.0 – 3.0 To pH 4–5 15 – 20 90 – 95 60 min
Full / Jet Black 3.0 – 5.0 To pH 4–4.5 20 – 25 95 60 – 75 min

For leather, adjust liquor ratio and drum time per substrate weight. For nylon, avoid pH below 4 to prevent fibre damage.

Shade Range

Achievable Shades — Acid Black 52

Shade range from light charcoal to jet black, depending on dye concentration. Actual on-fabric shade may vary with substrate, water quality, and auxiliary use. Request a dyed swatch for critical colour matching.

Light Charcoal
0.5 – 1.0% owf
Dark Grey
1.0 – 2.0% owf
Deep Black
2.0 – 3.0% owf
Jet Black
3.0 – 5.0% owf

Shade cards and dyed lab swatches available on request. Contact our technical team before finalising bulk colour targets.

Packaging

Available Pack Sizes

All sizes supplied in sealed, moisture-proof packaging. Custom pack sizes available for bulk contracts. Label includes batch number, manufacture date, and strength certificate.

1 kg
Trial / Lab
5 kg
Small Batch
10 kg
Standard Order
25 kg
Commercial Drum
50 kg
Bulk Drum
Custom
On Agreement
FAQ

Frequently Asked Questions — Acid Black 52

Acid Black 52 (ACID BLACK /EB) is a milling-class acid dye that produces a neutral, cool black on wool, nylon, and leather. As a milling dye, it bonds more tenaciously to protein and polyamide fibres than levelling blacks, delivering wash fastness of 4–5 and good resistance to rubbing. It is used in fine wool knitwear, nylon hosiery, leather garments, and shoe uppers where both shade depth and fastness durability are critical.

Standard exhaust process: enter wool at 40°C, add pre-dissolved dye, add acetic acid to pH 4.5–5.5, then raise temperature at 1–2°C/min to 85–95°C and hold for 45–60 minutes. Use Na₂SO₄ (15–20 g/L) as a levelling agent to slow strike rate and improve uniformity. After dyeing, rinse hot then cold. Avoid adding acid too quickly at the start — this causes unlevel strike and shade variation across the piece.

Acid Black 52 is a milling acid dye; Acid Black 1 is a levelling acid dye. Key differences: (1) pH — AB52 dyes at pH 4–6, AB1 typically needs pH 2–4, making AB52 gentler on wool fibres and chrome-tanned leather. (2) Fastness — AB52 has wash fastness 4–5 vs AB1's 3–4. (3) Shade — AB52 gives a cooler, more neutral black; AB1 gives a slightly warmer black. (4) Levelness — AB1 migrates more freely and self-levels better; AB52 requires careful temperature and acid control for level results.

Yes. Acid Black 52 gives good depth and levelness on nylon. For nylon, use pH 4.5–5.5 — avoid going below pH 4 to prevent fibre damage — at 90–95°C with Na₂SO₄ 15–20 g/L as a levelling agent. For carpet, where uniform pile dyeing is critical, use a controlled temperature rise of 1°C/min and maintain consistent pH throughout. A retarding agent (0.5–1 g/L) can be added if levelness is difficult to achieve.

Yes. Acid Black 52 is well suited for chrome-tanned leather used in shoe uppers, garments, and accessories. It is applied in a rotating drum at pH 4–5, 35–45°C, for 45–90 minutes depending on required penetration depth. For surface effect, use a shorter time at lower concentration. For through-dyeing, use a longer run with formic acid added near the end to exhaust residual dye from the bath.

Acid Black 52 delivers wash fastness of 4–5 on wool and nylon (ISO 105-C06). To maximise this, ensure complete bath exhaustion — dye left in the bath means less dye fixed on fibre. Adding formic acid at the end of the cycle (to drop pH to 3.5–4 for the final 10–15 minutes) helps drive final exhaustion. For leather, a proper fat-liquoring step after dyeing helps lock surface dye and prevents bleed-off in use.

Yes. Acid Black 52 is commonly used at low concentrations (0.5–1.5% owf) to produce charcoal and grey shades on wool and nylon. For a warm charcoal, combine with a small amount of Acid Orange or Acid Brown. For a cool blue-grey, combine with Acid Blue 113. The milling character of AB52 means shade is relatively stable once fixed, making it more predictable in combination recipes than levelling blacks. Always run a lab trial to verify shade before scaling up.

Acid Black 52 is compatible with other anionic acid dyes at the same pH range (pH 4–6). It is commonly used in trichromatic systems alongside Acid Blue 113 and Acid Red 114 for shade corrections in black and near-black dyeing. It is not a chrome mordant dye and should not be used in the same bath as metallic mordants. For automated dispensing systems, ensure the exhaustion profile of each dye is matched before committing to a combined batch.

MOQ is 10 kg. Lab samples of 1–5 kg are dispatched within 24 hours of order confirmation. Bulk orders are typically shipped within 7–15 working days from our Sayakha plant. Export orders are handled with full commercial documentation including COA, MSDS, and GST invoice. To place an order or request documentation, contact our technical team at technical@yobaiindustries.in or reach us via WhatsApp from the contact page.
Storage

Storage & Handling

Store in a cool, dry location below 30°C. Keep containers tightly sealed, away from moisture, direct sunlight, and strong oxidising agents. Do not store near alkaline materials. Check that packaging is intact before use.

Shelf Life
5 Years
From date of manufacture under recommended sealed storage conditions.

Handling Precautions

  • Wear appropriate PPE — gloves and dust mask during handling
  • Avoid inhalation of fine powder
  • Reseal containers immediately after use
  • Request MSDS from Yobai Industries for full safety data
Industries Served

Who Uses Acid Black 52?

This dye is used by manufacturers across the following industries. Contact us with your specific application for a grade recommendation.

Leather & Footwear
Wool & Silk Textiles
Nylon Carpet & Hosiery
Paper & Packaging
Inks & Printing
Available Grades

Acid Dyes — Available Grades

Yobai Industries carries the following grades in this dye family. Click any grade to view specifications, or view the full catalogue →

Acid Black 1 Acid Black 52 (This Grade) Acid Blue 113 Acid Blue 158 Acid Brown 75 Acid Brown 83 Acid Green 25 Acid Orange 142 Acid Red 114 Acid Yellow 42

Don't see the grade you need? We carry 250+ dye grades. Contact us and we'll source or develop it for you.

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Technical guide — application advice & grade selection
Need COA, MSDS or application guidance? Contact our technical team — technical@yobaiindustries.in

Ready to Order Acid Black 52?

MOQ 10 kg · Samples in 24 hours · Bulk in 7–15 days · Export worldwide · GST invoice with every order.

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