Trade Name: ACID BLACK 10 BX · CI Number: Acid Black 1
Acid Black 1 is one of the most produced acid dyes in the world. Its reputation isn't built on novelty — it's built on decades of consistent performance across wool, silk, nylon, leather, and paper applications. For dye houses working with wool tops or nylon carpet, it is often the first black they reach for, and the reason is straightforward: it exhausts reliably in an acidic bath, levels well even on fibres that are notoriously difficult to shade evenly, and delivers a deep, clean black without the process complexity of metal complex dyes.
As a levelling acid dye, Acid Black 1 dyes at pH 2–4 with formic or acetic acid as the acid source. No heavy salt is needed — the bath is kept simple. Sodium sulphate or a commercial levelling agent controls the strike rate on sensitive fibres like wool and nylon. It penetrates leather well under drum dyeing conditions and gives a solid cross-section colour. At Yobai Industries we supply it as ACID BLACK 10 BX — shade strength and solubility tested on every batch before dispatch.
Specifications are indicative. Contact us for a batch-specific TDS before placing a bulk order.
| Parameter | Value |
|---|---|
| Product Name | Acid Black 1 |
| Trade Name | ACID BLACK 10 BX |
| CI Number | Acid Black 1 |
| CAS Number | 1064-48-8 |
| Molecular Weight | 502.43 g/mol |
| Dye Class | Acid Dye |
| Sub-class | Levelling Acid Dye (Monoazo) |
| Colour | Black |
| Appearance | Black Powder |
| Ionic Character | Anionic |
| Solubility | Soluble in warm water (40–50°C). Pre-dissolve before adding to bath. |
| Application pH | 2–4 (formic acid or acetic acid) |
| Application Temp. | 90–100°C |
| Required Auxiliaries | Formic acid or acetic acid to pH 2–4; sodium sulphate or levelling agent 10–20 g/L; liquor ratio 1:10–1:20 |
| Exhaustion Rate | 75–85% (optimised bath, pH 3–4, 95°C) |
| Wash Fastness | 4 |
| Light Fastness | 4–5 |
| 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.
Exhaustion rates are indicative values under standard laboratory conditions. Results vary by substrate preparation, water hardness, and liquor ratio. Contact Yobai Industries for application-specific support.
| Property | Value / Rating |
|---|---|
| Physical Form | Fine black powder |
| Bulk Density | Approx. 0.4–0.6 g/cm³ (varies by grade) |
| Solubility in Water | Soluble; 40–60 g/L in warm water (40–50°C) |
| Dye Bath Stability | Stable at pH 2–6; do not use in alkaline conditions |
| Wash Fastness (ISO 105-C06) | 4 |
| Light Fastness (ISO 105-B02) | 4–5 |
| Rubbing Fastness — Dry | 4 |
| Rubbing Fastness — Wet | 3–4 |
| Perspiration Fastness (Acid) | 4 |
| Perspiration Fastness (Alkaline) | 3–4 |
| Acid Fastness | 4 (stable in acidic conditions) |
Fastness ratings are on the standard 1–5 scale (5 = best). Values are achieved after proper rinsing and fixation at the correct pH. Batch-specific COA with fastness data available on request.
Acid Black 1 dissolves well in warm water — around 40–60 g/L at 40–50°C. Never add the powder directly to a boiling dye bath. The correct method is to make a paste in cold water first, then bring up to 40–50°C with continuous stirring until fully dissolved. Filter through a fine mesh before adding to the bath — undissolved particles settle on the fibre surface and cause spots that cannot be corrected after dyeing.
Do not pre-dissolve in acidic solution (i.e., don't add acid to the stock solution). Keep the dye stock neutral and acidify only in the main dye bath after the goods have been added and the temperature has started to rise. This avoids premature strike and gives the levelling agent time to work.
All values are for exhaust dyeing on wool or nylon at liquor ratio 1:10–1:20. Adjust acid source and pH based on substrate sensitivity — use acetic acid for lighter shades and sensitive fibres; formic acid for deep shades requiring maximum exhaustion.
| Shade Depth | Dye (%owf) | pH | Acid Source | Temp (°C) | Time (min) |
|---|---|---|---|---|---|
| Charcoal (light black) | 1–1.5% | 3.5–4 | Acetic acid 2% | 90–95 | 30 |
| Medium Black | 2–3% | 3–4 | Acetic acid 2% | 95–100 | 45 |
| Deep Black | 4–5% | 2.5–3 | Formic acid 1–2% | 100 | 60 |
| Jet Black | 6–8% | 2–2.5 | Formic acid 2% | 100 | 60–75 |
Contact our technical team at technical@yobaiindustries.in for process optimisation specific to your machinery and water quality.
Acid Black 1 delivers a range of black depths depending on dye concentration. The following shade depths are achievable on scoured, mordanted wool or nylon under standard exhaust conditions.
Shade appearance varies depending on fibre preparation, mordanting, water hardness, and liquor ratio. Request a lab dip for colour-critical applications.
All packs are sealed in multi-layer moisture-proof bags. Custom packaging and private labelling available for bulk buyers.
All shipments include batch-specific COA. Export packing (UN-certified drums) available on request.
Store in a cool, dry location below 30°C with relative humidity below 65%. Keep containers sealed — even a partially open bag left in a humid weighing room will absorb moisture and degrade solubility over time. Keep away from strong oxidising agents and alkaline materials. Direct sunlight causes shade drift that cannot be corrected. Check packaging integrity before use and seal immediately after each weighing.
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.