Mordant Black 3

Synonym(s):2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-naphthalene-4-sulfonic acid sodium salt;Eriochrome blue-black B (C.I. 14640)

CAS NO.：3564-14-5
Empirical Formula: C20H15N2NaO5S
Molecular Weight: 418.4
MDL number: MFCD00003934
EINECS: 222-639-6
SAFETY DATA SHEET (SDS)
Update Date: 2023-04-23 13:52:06

What is Mordant Black 3?

Chemical properties

black fine crystalline powder

The Uses of Mordant Black 3

Eriochrome is to do titration indicator. Dubbed in aqueous solution or alcohol-soluble when used for the determination of calcium, magnesium, manganese, zinc and other metal ions, measured water hardness.

Preparation

4-Amino-3-hydroxynaphthalene-1-sulfonic acid diazotization, and Naphthalen-1-ol coupling.

Purification Methods

Free it from metallic impurities by three precipitations from aqueous solution by addition of HCl. The precipitated dye is dried at 60o under vacuum and converted into the Na salt with the calculated amount of alkali. It is an indicator in the complexometry of Al, Fe and Zr. [Beilstein 16 III 319.]

Properties and Applications

blue light grey to blue black. Soluble in water is purple, soluble in ethanol (in red), Acetone, insoluble in Toluene. In concentrated sulfuric acid for skipper, after dilution for shallow sauce red; In concentrated nitric acid for yellow solution. Dye aqueous solution to join concentrated hydrochloric acid for pale red light brown; Join concentrated sodium hydroxide solution for red wine.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
Standard	Ironing Fastness	Light Fastness	Alkali	Acid	Persperation Fastness	Soaping	Water
ISO	4-5	6	4-5	4	5	5	5
AATCC	4	6	4-5		5	5	5

Properties of Mordant Black 3

storage temp.	Store at +15°C to +25°C.
solubility	20g/l
form	Powder
Colour Index	14640
color	Purple to dark brown
PH	9.5 (10g/l, H2O, 20℃)
Water Solubility	Soluble in water(20 g/L (20 C).
EPA Substance Registry System	C.I. Mordant Black 3 monosodium salt (3564-14-5)

Safety information for Mordant Black 3

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H319:Serious eye damage/eye irritation
Precautionary Statement Codes	P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P280:Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P337+P313:IF eye irritation persists: Get medical advice/attention.