Acid Red 357 is a water-soluble acid dye formulated to produce bright red to red-violet shades on protein and polyamide fibers. It is primarily used for dyeing wool, silk and nylon in both lab and production dyehouses where consistent shade, good leveling and predictable performance are required. The dye is compatible with common acid-dye auxiliaries and can be applied in exhaust, continuous and pad-batch processes after suitability testing.
Acid Scarlet ML,Neutral red ML
Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light | |
Fading | Stain | |||||
ISO | Wool | 5 | 5 | 4-5 | 6-7 | |
Testing method | fiber | Alkali resistant | Carbonization | steaming wool | Alkaline fluff | seawater | soaping | Perspiration discoloration | Light fastness | |||
discoloration | stain | discoloration | stain | discoloration | stain | |||||||
ISO | wool | 3~4 | 4~5 | 4~5 | 4~5 | 4~5 | 4~5 | 4~5 | 5 | 5 | 4~5 | 6~7 |
Acid dyes typically show moderate to good wet fastness. To enhance performance consider: (1) optimised dyeing recipe and thorough rinsing, (2) appropriate use of fixing agents or leveling assistants designed for acid dyes, and (3) post-dyeing treatments recommended for the specific fiber (e.g., mild after-baths). Note that light fastness is dye-dependent; evaluate with accelerated light-fastness tests for outdoor or high-exposure uses.
Acid Red 357 is optimized for protein fibers (wool, silk) and synthetic polyamide fibers such as nylon. It is not effective on untreated cellulose fibers (cotton) without a mordant or carrier system designed for acid dyes.
Yes — it can be blended with other acid dyes to tune hue and depth, but always run compatibility and migration tests. For continuous or pad-batch processes, adapt the fixation and after-treatments to the process and re-test recipes at production speed to avoid surprises.
