Acid Red 315

Acid Red 315 is a water-soluble acid dye typically supplied as a red crystalline powder. It is a monoazo / 1:2 metal-complex acid dye with a bluish-red shade, widely used for dyeing and printing polyamide (nylon), wool and silk, and also applied in leather, paper and some specialty coatings. It offers good light fastness and satisfactory washing/soaping fastness, and dissolves readily in aqueous dye-baths while showing poor solubility in non-polar organic solvents.

TRADE NAME:Acid Red MS-BB,Neutral red S-G

Main features

• Appearance: red crystalline powder, bluish-red hue.
• Classification: monoazo / 1:2 metal-complex acid dye.
• Solubility: highly soluble in water; limited solubility in non-polar organic solvents.
• Substrate compatibility: optimized for polyamide (nylon), also suitable for wool and silk; used in leather and paper printing.
• Light fastness: good (ISO ~6–7 reported).
• Washing/soaping fastness: moderate to good (typical ratings ~4–5 depending on substrate and process).
• Typical physical form & packing: fine powder; commonly supplied in drums or 25 kg bags (check supplier TDS/MSDS).
• Processing notes: requires acidic dye-bath (pH control) and good dispersion to avoid leveling issues on protein fibers.

Technical Specifications

• ‍CAS NO: 12220-47-2
• Shade: Yellow light red‍

Application:

• Mainly used for sea of target that fluorescent, facilitate aerial reconnaissance search. And can use significantly for the exploration of fluorescent groundwater. Can also be used for medicine and cosmetics shading, rarely used for silk printing and dyeing things.
• Monosulfonate 1:2 metal complex dyes, mainly used for dyeing and printing wool, silk, nylon and blended fabrics, and also for leather dyeing.‍

FAQ

What fibers give the truest shade with Acid Red 315?

Acid Red 315 typically gives the most consistent, saturated bluish-red shades on polyamide (nylon). On protein fibres like wool and silk, expect slightly warmer or deeper hues—shade depth will depend on liquor ratio and pH control during dyeing.

What pH and auxiliaries are recommended for best levelness?

Use an acidic dye bath (commonly pH 4.0–5.5 for nylon; slightly lower for wool). Start dyeing at low temperature and raise slowly for even uptake. Leveling agents (anionic or non-ionic dispersants designed for acid dyes) and controlled electrolyte addition can reduce streaking—always validate with lab trials.

How fast is Acid Red 315 to light and washing—what should customers expect?

Typical supplier data report light fastness in the ISO ~6–7 range (good), and washing/soaping fastness around 4–5 (moderate to good). Final performance depends on substrate, after-treatments and dyeing conditions—perform finishing tests if outdoor or professional wash durability is required.

Is Acid Red 315 safe for leather and paper printing?

It is commonly used for leather and paper printing, but safety for a given finished product depends on migration, extractables and regulatory limits. Consult the supplier's MSDS/TDS for heavy-metal content, and run migration/crocking tests for leather goods that contact skin.

Why does Acid Red 315 sometimes give uneven results on blends?

On blended fabrics (e.g., nylon/cotton), dissimilar fiber chemistry causes differential dye uptake. Nylon takes acid dyes well; cellulose does not. For blends, either use pre-treatment, fiber-specific dyeing sequences, or select a dye system compatible with both fibers.

What practical checks should a dye-house run before scale-up?

Run small-bath lab trials measuring shade, exhaustion (by spectrophotometer), wash and light fastness, and perform pH/electrolyte ramp tests. Also review supplier TDS for recommended liquor ratio, dispersing aids, and packaging to avoid surprises at production scale.