Orange G 1% is an aqueous solution of the synthetic azo dye Orange G. It is a 1% concentration of the dye in water. Orange G is commonly used in histology and cytology as a dye to visualize various structures within cells and tissues.

In histology, Orange G is often used as part of multicolor staining methods, such as in Papanicolaou staining and Masson trichrome staining. In these methods, Orange G is used with other dyes to selectively stain different cell structures and tissue components to better distinguish them from one another.

Orange G binds predominantly to cytoplasmic proteins and is particularly useful for labeling plasmalemma (cell membranes) and cytoplasm. This dye allows researchers and pathologists to more easily identify and analyze the organization and structure of cells and tissues in stained specimens.

The 1% aqueous Orange G solution is usually ready to use and can be applied directly to the tissue to be stained. It is important to follow proper staining protocols and concentrations to achieve optimal results and clear differentiation between different cell structures.