Description

n-[4-[(3-Carboxylato-4-Hydroxy-1-Naphthalenyl)[4-(Dimethylamino)Phenyl]Methylene]-2,5-Cyclohexadien-1-Ylidene]-n-Methylmethanaminium is a high-purity, water-soluble organic salt belonging to the triarylmethane dye class, valued for its intense color and chelating properties. This compound is critical for applications requiring precise colorimetric detection and complexometric analysis. It is primarily sought by manufacturers and research laboratories in the analytical chemistry, biochemical research, and specialty chemical synthesis sectors.

Application

• Complexometric Indicator: Widely used as a metallochromic indicator in EDTA titrations for the determination of calcium, magnesium, and other metal ions in water hardness testing and analytical procedures.
• Biochemical Staining: Employed in histological and cytological staining protocols for visualizing specific cellular components in microscopy.
• Dye Intermediate: Serves as a key precursor or intermediate in the synthesis of more complex dyes and pigments for specialized applications.
• Research & Development: Utilized in academic and industrial R&D for developing new colorimetric assays, sensors, and detection methods.
• Laboratory Reagent: Supplied as a high-purity analytical reagent for standardizing solutions and conducting precise quantitative analysis.

Basic Information

Item	Details
Product Name	n-[4-[(3-Carboxylato-4-Hydroxy-1-Naphthalenyl)[4-(Dimethylamino)Phenyl]Methylene]-2,5-Cyclohexadien-1-Ylidene]-n-Methylmethanaminium
CAS No.	6391-38-4
Molecular Formula	C28H25N2O4-
Molecular Weight	453.51 g/mol
Synonyms	Calconcarboxylic Acid; 3-Hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthyl)azo]-1-naphthalenesulfonic Acid (related azo form); Calcon; Patton and Reeder's Indicator; Mordant Black 17 (CI 15705); Acid Chrome Dark Blue; Eriochrome Blue Black R; NSC 403079
EINECS	228-991-6

Quality Control

Our production of Calconcarboxylic Acid adheres to stringent quality protocols to ensure batch-to-batch consistency and reliability for sensitive analytical work. Each lot is tested against established specifications for identity, purity, and performance as a metallochromic indicator. A comprehensive Certificate of Analysis (COA) detailing assay results, impurity profiles, and physical characteristics is provided with every shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed in a low-humidity environment to prevent degradation and ensure long-term stability.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Residue on Ignition (Sulfated Ash)	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Performance as Indicator	Conforms to reference standard

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