从India供应商批发进口Acid Brown 355 — FOB条款

Acid Brown 355 is a metal-complex acid dye supplied by Sparrowings International from Ahmedabad, Gujarat, with the chemical formula C36H20CrN8Na2O14S2 and CAS number 60181-77-3. The dye arrives as a brown powder formulated for leather dyestuffs and wood stain applications, reflecting the region's established specialisation in synthetic organic colourants. Its chromium-based complex structure delivers the lightfastness and wet-fastness properties that tanneries require for consistent colour uptake on protein substrates.

The formulation relies on a 1:2 chromium azo complex, a standard architecture in acid metal complex dyes where two dye molecules coordinate with a single chromium(III) centre. This geometry produces superior migration and levelness compared to pre-metallised alternatives, particularly on chrome-tanned leather where standard acid dyes would bind unevenly. The sodium salt form ensures ready solubility in aqueous application baths at 40-60 degrees Celsius, with typical exhaustion rates of 80-95 percent under controlled pH between 4.0 and 5.5. Gujarat's dyestuff cluster provides established access to the intermediates, including J-acid and chromotropic acid derivatives, that underpin this chemistry.

Primary buyers include leather finishing houses, furniture upholstery tanneries, and wood coating formulators seeking brown shades with depth and transparency. The powder form suits volume metering in automated colour kitchens and manual weighing in smaller tannery laboratories alike. Importers should confirm with Sparrowings International whether the material is supplied as a standard strength (150 percent) or adjusted for specific substrate requirements, and whether technical data sheets include metamerism indices and fastness ratings to ISO standards.

Sparrowings International operates from D-101, Maruti Homes in Nana Chiloda, Ahmedabad, Gujarat, a location within India's most concentrated dyestuff manufacturing belt. The supplier holds a harbor trust tier, which indicates a verified business presence though buyers should note the zero percent response rate and zero average response hours recorded on the listing, suggesting limited or no recent engagement through platform channels. No manufacturing facility details, export licence numbers, or quality management certifications are stated in the available profile.

The listing positions Sparrowings International as a brand-name supplier of Acid Brown 355 with specified usage in leather dyestuffs and wood stain dye applications. The source description provides chemical identity data (CAS, formula) and origin confirmation but omits production capacity, annual turnover, employee count, and client references. Buyers should independently verify the company's manufacturing credentials, whether it operates as a formulator, trader, or manufacturer, and its experience with export documentation such as MSDS, TDS, and REACH-compliant safety data sheets.