Eosin–Erythrosin Counterstain
Eosin–Erythrosin Counterstain is a combined acidic dye solution used in histology and cytology as a counterstain to provide contrast after primary staining, particularly following hematoxylin staining. It enhances cytoplasmic and extracellular structure visibility.
Chemical Name
Mixture of Eosin Y and Erythrosin B dyes
Synonyms
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Eosin–Erythrosin Stain
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Acid Dye Counterstain
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Histological Counterstain
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Cytoplasmic Stain
CAS Number
Mixture (no single CAS number)
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Eosin Y: 17372-87-1
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Erythrosin B: 548-28-3
Appearance
Red to pink solution

Key Properties
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Acidic dye mixture
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Stains cytoplasm and extracellular proteins
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Provides strong colour contrast
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Compatible with hematoxylin stains
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Ready-to-use solution
Uses
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Histology tissue staining
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Cytology staining procedures
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Hematoxylin and Eosin (H&E) staining protocols
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Pathology and research laboratories
Storage
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Store in tightly closed container
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Keep in a cool, dry place
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Protect from direct light
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Avoid contamination
Safety & Handling (SDS Summary)
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May cause skin and eye irritation
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Avoid ingestion and inhalation
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Use appropriate PPE: gloves, lab coat, eye protection
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Dispose of according to local laboratory waste regulations
| Weight | N/A |
|---|---|
| size | 500mLt, 1Lt |










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