Acid Dyes

Acid Yellow 42 Manufacturer in India

Trade Name: ACID YELLOW PN  ·  CI Number: Acid Yellow 42

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

Acid Yellow 42 — Product Overview

Acid Yellow 42 is a monoazo milling acid dye with a molecular weight of approximately 489 g/mol, producing a clean, bright yellow shade on wool, silk, nylon, and leather. It operates effectively at a slightly wider pH range (4–6) than most milling dyes, which allows for gentler application conditions on delicate substrates and makes it easier to achieve level dyeing on fine wool counts and silk without dedicated retarding agents.

AY42 is the yellow component in standard trichromatic acid dyeing systems, combined with Acid Red 114 and Acid Blue 113 to cover the full commercial shade gamut on wool and nylon. In olive and khaki recipes, it is used alongside Acid Brown 83 and Acid Blue 158. On leather, it is drum-dyed at 40–55°C with formic acid (pH 4–5.5) and fixed at pH 3.5–4 in the final minutes, giving a clean lemon-to-golden yellow on chrome-tanned leather.

For nylon carpet, AY42 is used in gold, straw, and yellow colourways at pH 4.5–5.5 and 90–95°C. On silk, temperature is held to 82–85°C with ammonium sulphate preferred over acetic acid. Yobai Industries supplies Acid Yellow 42 as ACID YELLOW PN with consistent colour strength and COA on every dispatch.

Applications

  • Wool and silk fabric dyeing
  • Nylon hosiery and knitwear
  • Leather finishing
  • Trichromatic shade recipes
Substrates

Suitable For

  • Wool
  • Silk
  • Nylon
  • Leather
Benefits

Key Benefits

  • Clean, bright yellow shade
  • Good levelness on wool and nylon
  • Good compatibility in trichromatic systems
  • Suitable for both light and medium yellow shades
  • Reliable batch-to-batch consistency
Technical Specifications

Acid Yellow 42 — Technical Specifications

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

ParameterValue
Product NameAcid Yellow 42
Trade NameACID YELLOW PN
CI NumberAcid Yellow 42
CAS NumberAvailable on request
ColourYellow
AppearanceYellow Powder
Ionic CharacterAnionic
SolubilitySoluble in hot water.
Molecular Weight~489 g/mol
Dye ClassAcid Dye
Sub-classMilling Acid Dye
Application pH4–6
Application Temp.85–100°C
Required AuxiliariesAcetic acid to pH 4–6; sodium sulphate (10–20 g/L) as levelling agent
Wash Fastness4
Light Fastness4
Packaging1 kg · 5 kg · 10 kg · 25 kg · 50 kg · Custom packaging available
Shelf Life5 years from manufacture (cool, dry storage)
ManufacturerYobai Industries, Sayakha, Gujarat, India
GSTINGST Registered

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

Chemical & Physical Properties

Acid Yellow 42 — Chemical & Physical Data

Identification

CI NumberAcid Yellow 42
CAS NumberAvailable on request
Molecular Weight~489 g/mol
Ionic CharacterAnionic
Dye ClassMilling Acid Dye (Monoazo)

Physical Properties

AppearanceYellow powder
SolubilitySoluble in hot water
Application pH4–6
Dyeing Temperature85–100°C (textile); 40–55°C (leather)
Wash Fastness4 (ISO 105-C06)
Light Fastness4 (ISO 105-B02)
Dosage Guide

Acid Yellow 42 — Recommended Dosage

General guide for exhaust dyeing on wool and nylon. For silk, limit temperature to 82–85°C and use ammonium sulphate.

Shade Depth% owfAcid (pH)Na₂SO₄ (g/L)Temp (°C)Time (min)
Pale Lemon0.1–0.5%pH 5–610–158530
Bright Yellow0.5–1.5%pH 4.5–5.515–209045
Golden Yellow1.5–3.0%pH 4–515–209560
Deep Amber3.0–5.0%pH 3.5–4.52010060–75

% owf = percentage on weight of fibre. AY42 works at a wider pH range (4–6) than most milling dyes — higher pH improves levelness on fine wool counts.

Shade Range

Acid Yellow 42 — Achievable Shades

Representative shades on wool under standard exhaust conditions.

Pale Lemon
0.1–0.5% owf
Bright Yellow
0.5–1.5% owf
Golden Yellow
1.5–3.0% owf
Deep Amber
3.0–5.0% owf
Packaging Options

Acid Yellow 42 — Pack Sizes

1 kg
Lab / R&D sample
5 kg
Trial batch
10 kg
Small production
25 kg
Standard drum
50 kg
Bulk production
Custom
On request
FAQ

Frequently Asked Questions — Acid Yellow 42

Acid Yellow 42 is a monoazo milling acid dye that produces a clean, bright yellow shade on wool, silk, nylon, and leather. It works at a slightly wider pH range (4–6) than most milling dyes, which allows for gentler application conditions on delicate substrates. It is the standard yellow component in trichromatic acid dyeing systems and also used as a standalone golden-yellow in direct shade applications.

Set bath pH 4.5–5.5 with acetic acid and sodium sulphate (15–20 g/L). Enter wool at 50°C, raise to 90–95°C over 30 minutes and hold for 45–60 minutes. AY42 performs well at pH 5 for fine wool — the higher pH reduces strike speed and improves levelness. For coarser wool yarns and heavy fabrics, lower pH to 4–4.5 and raise temperature to 100°C for complete exhaustion at deep shades.

AY42 is the yellow component in standard trichromatic acid dye systems. Combined with Acid Red 114 (red) and Acid Blue 113 (blue), it provides the full commercial shade gamut on wool and nylon — from pale yellows through greens, oranges, browns, and khakis. In olive and khaki recipes specifically, AY42 is used alongside Acid Brown 83 and Acid Blue 158. Its wider pH tolerance makes it compatible with the slightly different exhaust conditions needed by milling blues in the same bath.

Yes. For silk, limit temperature to 82–85°C and use ammonium sulphate (pH 5–5.5) instead of acetic acid. AY42's wider pH tolerance makes it particularly suitable for silk, where gentler conditions are important. It produces a bright lemon-to-golden yellow on silk at these conditions. A silk-compatible levelling agent helps at concentrations above 1% owf to prevent uneven uptake at the lower temperature.

Yes. For chrome-tanned leather, drum-dye at 40–55°C, pH 4–5.5 with formic acid. Float ratio 100–150%. Run 60–90 minutes then drop pH to 3.5–4 in the final 15 minutes to fix. AY42 gives a clean lemon-to-golden yellow on leather. In leather colour recipes, it is used as the yellow component in orange, khaki, and tan blends alongside browns and oranges. The milling character provides good rub fastness after proper fixation.

For pale lemon, use 0.1–0.5% owf at pH 5–6 and 85°C for 30 minutes. For deep amber, increase to 3–5% owf at pH 3.5–4.5 and 100°C for 60–75 minutes. As concentration increases, the shade shifts from clean cool lemon toward warm golden-amber. At deep shades, a slight orange development is normal. Adding Acid Orange 142 at 0.3–0.5% owf at high depth keeps the shade golden rather than amber-green.

Yes. AY42 dyes nylon carpet at pH 4.5–5.5 using ammonium sulphate, exhausting at 90–95°C for 45–60 minutes. It is used for yellow, gold, and straw colourways in carpet ranges, and as the yellow component in green and olive carpet blends. For nylon hosiery, the milling character provides good wash and perspiration fastness, which is important for body-contact applications.

For khaki (warm yellow-brown): blend AY42 with Acid Brown 83 (olive-brown) and Acid Black 52 (to deepen and knock back). For olive-green: use AY42 with Acid Green 25 (adds green brightness) and Acid Brown 83 (adds earth tone). For military olive: AY42 + Acid Brown 83 + Acid Blue 158 (in small amounts to cool the shade). All are milling-class dyes that work in the same acidic bath. Confirm ratios in a lab trial first.

Minimum order quantity is 10 kg. Samples of 1–5 kg dispatched within 24 hours from Sayakha, Gujarat. Standard bulk orders ship within 7–15 working days. Every order ships with a GST invoice; batch-specific COA and TDS available on request. Contact us at technical@yobaiindustries.in or WhatsApp +91 97277 32326.
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 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 Yellow 42?

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

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 Yellow 42?

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

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