Description

C.I. Acid Red 53 is a synthetic, water-soluble azo dye belonging to the acid dye class, widely recognized for its vibrant red color. This high-purity colorant is valued for its strong tinctorial strength and good lightfastness in various applications. It is primarily used by manufacturers in the cosmetics, pharmaceutical, and specialty chemical industries seeking a reliable and compliant red dye for non-food products.

Application

• Primary colorant in cosmetic formulations, including lipsticks, nail polishes, and other decorative makeup products.
• Coloring agent for pharmaceutical tablets, capsules, and coatings where a distinctive red color is required for product identification.
• Dye for industrial inks and specialty printing applications.
• Staining agent in biological and histological applications in laboratory settings.
• Coloration of soaps, detergents, and other personal care products (where permitted by regulations).
• Used in the coloring of paper products and specialty stationery.

Basic Information

Product Name	C.I. Acid Red 53
CAS No.	6245-61-0
Molecular Formula	C18H14N2Na2O7S2
Molecular Weight	480.42 g/mol
Synonyms	Acid Red 53; D&C Red No. 28; Food Red 105; FD&C Red No. 28; Eosin YS; Eosine; 2',4',5',7'-Tetrabromo-3',6'-dihydroxyspiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one disodium salt; Bromoeosine
EINECS	228-378-3

Quality Control

Our C.I. Acid Red 53 is manufactured under a strict quality management system to ensure batch-to-batch consistency and purity. It is tested against relevant industry specifications for colorants, including potential heavy metal content and dye purity. A comprehensive Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Red to reddish-brown powder
Identification (UV-Vis)	Conforms
Assay (Color Strength)	≥ 95%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 30.0%
Heavy Metals (as Pb)	≤ 20 ppm
Arsenic (As)	≤ 3 ppm
Lead (Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.