Fast Green Solution for m.s.

Fast Green Solution for microscopy (m.s.) is an aqueous staining solution containing Fast Green FCF (Food Green 3), a synthetic organic dye used extensively as a counterstain in histology and microscopy. Fast Green FCF is a triarylmethane dye known for staining connective tissues such as collagen fibers, providing a green coloration that contrasts well with other dyes in multi-staining procedures.

Composition:

Fast Green FCF (disodium salt of a sulfonated triarylmethane dye)

Solvent: Typically water or buffered aqueous solution

Occasional additives: Acetic acid or alcohol may be present to improve stain uptake or fixative penetration

Properties:

Chemical formula: C37H34N2Na2O10S3

Appearance: Turquoise to green dye in solution form

Usage concentration: Prepared as a dilute solution for microscopic staining

Staining behavior: Provides bright green staining of collagen and cytoplasmic components, often used as a counterstain after hematoxylin or eosin

Applications:

Histological staining of connective tissue

Counterstain in microscopy protocols to enhance contrast

Used in biology and medical laboratories for tissue section visualization

Safety:

Generally safe at staining concentrations but handle with care to avoid ingestion or skin contact

Store in a cool, dry place, protected from light

This description fits well for laboratory product catalogs, histology reagent datasheets, and microscopy supply sources.​