Eosin yellow 2% w/v solution for m.s

A 2% w/v eosin yellow solution is commonly used as a biological stain in microscopy, especially for monochrome staining of microbial smears and as a counterstain in hematoxylin and eosin (H&E) staining protocols.​

Preparation

Dissolve 2 g of Eosin Y dye in 100 ml of distilled water to make a 2% w/v solution.​

The resulting solution is orange-red, miscible with water and alcohol, and exhibits yellowish-green fluorescence.

Optionally, a small amount of glacial acetic acid may be added to intensify staining, but for standard use, water alone suffices.​

Application

Flood the fixed smear with eosin yellow 2% solution for 2–3 minutes or briefly heat for less than 30 seconds.

Wash the slide in slow-running water, blot dry, and examine under a microscope using oil immersion.​

This solution is suitable for standard microscopic staining and produces strong cytoplasmic coloration in tissue or microbial specimens.