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.
Acid Red MS-BB,Neutral red S-G
Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light | |
Fading | Stain | |||||
ISO | Wool | 4-5 | 4-5 | 5 | 6-7 | |
Testing method | fiber | seawater | soaping | Perspiration | Light fastness | ||
discoloration | stain | discoloration | stain | ||||
ISO | nylon | 4~5 | 5 | 4~5 | 4~5 | 5 | 6~7 |
Soaping ISO105-C01 (40℃) | Alkali perspiration ISO105-E04 | Flooding ISO105-E01 | Alkaline fluff ISO105-E12 | Light fastness ISO105-B02 | |||||||||
discoloration | wool stain | cotton stain | discoloration | wool stain | cotton stain | discoloration | wool stain | cotton stain | discoloration | wool stain | cotton stain | Standard dyeing depth | |
1/12 | 1/1 | ||||||||||||
4~5 | 4~5 | 5 | 4~5 | 4~5 | 5 | 4~5 | 4~5 | 5 | 4~5 | 4~5 | 5 | 4 | 6 |
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.
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.
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.
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.
