Acid Dyes
Metanil Yellow
A bright yellow acid dye with a long history as a laboratory pH indicator.
Overview
Metanil Yellow is an azo acid dye that gives a strong, clean yellow in aqueous solution. Beyond colouration, it is well known in analytical chemistry as a pH indicator, shifting from red to yellow across the pH 1.2–3.2 range, which reflects the same acid-base structural behaviour that governs its dyeing performance. As with other acid dyes, it applies most effectively to protein and polyamide fibres and related substrates from an acidic bath.
Colour Reference
Appearance, dilution, and application
Appearance
Dilution
Application
Applications
Where it is used
- Paper and paper products
- Wool, silk, and nylon dyeing
- Laboratory and indicator use
- Leather and selected industrial applications
Benefits
Why mills choose it
Strong, clean yellow shade
Well-documented acid dye chemistry
Useful as a pH indicator in lab settings
Suitable for paper and protein-fibre coloration
Identity & Data
Technical data
Typical values. For a full technical datasheet or safety data sheet, get in touch.
- C.I. Name
- C.I. Acid Yellow 36
- C.I. Number
- 13065
- CAS Number
- 587-98-4
- Molecular Weight
- 375.38
- Molecular Formula
- C18H14N3NaO3S
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