Acid Red 52 is a water-soluble acid dye formulated for protein and polyamide fibers and for specialty applications in inks and certain coatings. It offers bright red shade potential, reliable wet-fastness when correctly fixed, and predictable performance in low-pH dye baths. Acid Red 52 is designed for controlled exhaustion dyeing and spotting applications where uniform shade and good reproducibility between batches are required.
TRADE NAME:Acid Rhodamine B,Acid Rose B
Leveling(grade) | Displacement | Whitening | Solubility(g/L) | Metal ion effect(grade) | ||
copper | iron | chromium | ||||
5 | A | Very bad | 200(100℃) | 3 | 4 | — |
Test Methods | fiber | Alkali resistance | Carbonization | Chlorination discoloration | Oxygen bleaching | Alkali fluff | Acid fluff | potting | soaping | Perspiration | Sun exposure | ||||
discolor | Staining | discolor | Staining | discolor | Staining | discolor | Staining | ||||||||
AATCC | wool | 2 | 3~4 | 1 | 1 | 2 | 2 | — | — | — | — | 3 | 3 | 3 | 2~3 |
ISO | wool | 3~4 | 3 | 1 | 1 | 1 | 3 | 3 | 1 | 2 | 1 | 3~4 | 3 | 4 | 3 |
Mainly used for wool, silk and polyamide fiber dyeing, also can be used for wool and a variety of fabric dyeing, still can be in wool and silk fabric printing directly, also can used for leather dyeing.
Acid Red 52 is optimized for protein fibers (wool, silk) and polyamide fibers (nylon). It produces the most consistent results on pre-scoured, neutral-to-acidic substrates. For synthetic blends, pretesting is recommended to check affinity and shade.
Start with warm water and dissolve the dye fully before adding fibers. Typical starting pH is 3.0–4.0 (adjust using acetic acid or formic acid). Lower pH increases exhaustion rate; adjust slowly while monitoring shade. Always run a lab sample to set final pH for your specific recipe.
As a practical starting point, many mills trial Acid Red 52 at 0.2–1.0% weight of fiber (owf) for shade control; finer adjustments are made by recipe and liquor ratio. Fixation is achieved by maintaining acidic pH during final exhaust and a short hold at process temperature. These are starting guidelines — perform bench trials to finalize process parameters for your equipment.
Leveling agents for acid dyes, mild acid dispersing agents, and appropriate salts (where used) can improve uniformity. To enhance wet-fastness, use post-treatment fixes recommended for acid dyes (e.g., polymeric after-treats or crosslinking aids designed for protein/polyamide fibers). Avoid oxidizing post-treats unless compatible with the dye chemistry.
Acid Red 52 typically shows moderate lightfastness and good-to-moderate washing/wetfastness when correctly exhausted and post-treated. Exact fastness grades depend on substrate, shade depth and fixation method; deeper shades often display slightly reduced lightfastness compared to pale shades.
Yes — Acid Red 52 can be adapted to continuous exhaustion and padding processes, but recipe and pad liquor pick-up must be optimized. Continuous applications generally require a narrower pH and temperature window and close control of liquor pickup to maintain reproducible shade and fastness.
Store sealed in a cool, dry place away from strong oxidizers and direct sunlight. Typical shelf life is 1–2 years for solid formulations if kept dry and unopened; liquid concentrates should be used within the manufacturer’s specified window — check the Certificate of Analysis for storage recommendations and expiry.
Handle Acid Red 52 with standard chemical safety precautions: avoid inhalation of dust, use gloves and eye protection, and follow MSDS instructions. Waste dye baths should be treated according to local wastewater regulations; avoid discharging untreated concentrated dye liquor. For disposal and regulatory compliance, consult the product safety data sheet and your local environmental guidelines.
Begin with a lab-scale exhaustion trial at the target liquor ratio and a standardized shade recipe. Use spectrophotometric measurements (e.g., ΔE analysis) to compare with the target and iteratively adjust percent owf, pH, and auxiliaries. For production-level matching, request a lab sample or small trial batch and document the final recipe for reproducibility.
Yes, Acid Red 52 can be formulated into aqueous inks and some coatings where water-soluble acid dyes are acceptable. Compatibility depends on binder chemistry and required fastness; testing for bleed, migration and binder compatibility is essential before scale-up.
