Trade Name: ACID BROWN TN · CI Number: Acid Brown 75
Acid Brown 75 is one of the most important brown acid dyes for the leather industry, offering excellent penetration, good rub fastness, and a warm natural brown shade. It is widely used in shoe upper leather, automotive upholstery, and wool dyeing. As a milling-class acid dye, it bonds more firmly to the fibre than levelling dyes, translating into better durability under abrasion and washing — a critical requirement for finished leather goods.
In leather processing, drum dyeing conditions for AB75 differ from textile exhaust dyeing. Leather is dyed at 40–55°C — high temperatures are not needed and would damage the hide structure. The bath is acidified with formic acid to pH 3.5–5 for good dye uptake, then dropped to pH 3.5 for final fixation. This two-stage acidification ensures even penetration through the cross-section and improved rub fastness on the finished surface.
On wool and nylon, AB75 performs under standard acid dye exhaust conditions (85–100°C, pH 3–5), producing a warm sienna-to-chocolate brown depending on concentration. It blends cleanly with Acid Black 1 for deeper neutral browns and with Acid Blue 158 for cool-brown and charcoal directions. Yobai Industries supplies this as ACID BROWN TN — batch-tested before every dispatch.
Specifications are indicative. Contact us for a batch-specific TDS before placing a bulk order.
| Parameter | Value |
|---|---|
| Product Name | Acid Brown 75 |
| Trade Name | ACID BROWN TN |
| CI Number | Acid Brown 75 |
| CAS Number | Available on request |
| Colour | Brown |
| Appearance | Brown Powder |
| Ionic Character | Anionic |
| Solubility | Soluble in hot water. |
| Molecular Weight | ~630 g/mol |
| Dye Class | Acid Dye |
| Sub-class | Milling Acid Dye |
| Application pH | 3–5 |
| Application Temp. | 85–100°C |
| Required Auxiliaries | Formic acid or acetic acid to pH 3–5; sodium sulphate for levelling |
| Wash Fastness | 4 |
| Light Fastness | 4 |
| Packaging | 1 kg · 5 kg · 10 kg · 25 kg · 50 kg · Custom packaging available |
| Shelf Life | 5 years from manufacture (cool, dry storage) |
| Manufacturer | Yobai Industries, Sayakha, Gujarat, India |
| GSTIN | GST Registered |
Need a full TDS, COA, or MSDS? Request it here or WhatsApp us directly.
General guide for exhaust dyeing on wool and nylon. For leather drum dyeing, contact us for substrate-specific parameters.
| Shade Depth | % owf | Acid (pH) | Na₂SO₄ (g/L) | Temp (°C) | Time (min) |
|---|---|---|---|---|---|
| Pale Tan | 0.1–0.5% | pH 4.5–5 | 10–15 | 85 | 30 |
| Medium Brown | 0.5–1.5% | pH 4–5 | 15–20 | 90 | 45 |
| Deep Brown | 1.5–3.0% | pH 3.5–4.5 | 15–20 | 95 | 60 |
| Dark Chocolate | 3.0–5.0% | pH 3–4 | 20 | 100 | 60–75 |
% owf = percentage on weight of fibre. Use formic acid or acetic acid to adjust pH. For leather drum dyeing, temperature of 40–55°C is sufficient — high temperatures are not required.
Representative shades on wool under standard exhaust conditions. Actual colour varies with substrate, pH, and concentration.
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.
Guaranteed 5 years from date of manufacture when stored under recommended conditions. COA and manufacturing date provided with every batch.
This dye is used by manufacturers across the following industries. Contact us with your specific application for a grade recommendation.
Yobai Industries carries the following grades in this dye family. Click any grade to view specifications, or view the full catalogue →
Don't see the grade you need? We carry 250+ dye grades. Contact us and we'll source or develop it for you.
MOQ 10 kg · Samples in 24 hours · Bulk in 7–15 days · Export worldwide · GST invoice with every order.