Description

Alizarin Yellow R is a synthetic azo dye widely recognized for its use as a pH indicator and biological stain. Its precise chemical structure and consistent performance make it a valuable analytical reagent in research and industrial quality control processes. This product is essential for laboratories and manufacturers in the chemical, educational, and life science sectors requiring reliable colorimetric analysis.

Application

• pH Indicator: Used in titrations and analytical chemistry to determine pH endpoints within its transition range.
• Biological Staining: Employed in microscopy for staining tissues and cells in histological studies.
• Educational Reagent: A common component in chemistry laboratory kits for teaching acid-base concepts.
• Industrial Testing: Applied in various quality control processes that require visual pH monitoring.
• Research & Development: Utilized in biochemical and chemical research projects involving pH-sensitive reactions.

Basic Information

Product Name	Alizarin Yellow R
CAS No.	66676-71-9
Molecular Formula	C13H9N3O5
Molecular Weight	287.23 g/mol
Synonyms	Alizarin Yellow RW; Mordant Orange 1; Alizarin Yellow GG; 5-(4-Nitrophenylazo)salicylic acid; 2-Hydroxy-5-[(4-nitrophenyl)azo]benzoic Acid; CI 14030; Acid Alizarin Yellow R; Nitrazol Yellow
EINECS	266-451-8

Quality Control

Our Alizarin Yellow R is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure identity, purity, and performance consistency as a pH indicator. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming compliance with our internal specifications.

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, keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to brownish-orange powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
pH Transition Range	10.1 - 12.0 (Yellow to Red)
Loss on Drying	≤ 2.0 %
Residue on Ignition	≤ 0.5 %

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