Eosin bluish 0.5%, in ethanol 70% is a staining solution used in biological and medical research, especially in histology and cytology. Eosin is an acidic dye used primarily to stain basic tissue components and structures, such as cytoplasm, collagen fibers and extracellular matrix. Generally, eosin stains these structures a light to bright red or pink. The bluish version of Eosin provides a cooler staining tint and can be helpful to highlight certain aspects of tissue structure or to complement the color image in multiple stains.

The 0.5% solution of Eosin bluish in 70% ethanol ensures optimal staining of tissue sections and cell preparations. The alcoholic base of the solution ensures rapid and effective staining of target structures and facilitates subsequent dehydration of the preparations during microscopic examination.

Eosin bluish 0.5 %, in ethanol 70 % is often used in combination with other staining agents, such as hematoxylin, to provide differentiated visualization of various tissue structures. The combination of eosin and hematoxylin, also known as hematoxylin-eosin staining (HE staining), is one of the most commonly used staining techniques in histology and pathology.