toluidine blue
/ˈtɒljʊɪdiːn
/ /tɒˈljuː-/noun [mass noun]
A synthetic blue dye used chiefly as a stain in biology.
- A thiazine dye; chemical formula: C15H16ClN3S.
- The matrix or ground substance of cartilage is strongly basophilic and stains metachromatically with toluidine blue and other similar basic dyes.
- Inactive DNA is readily stained with hematoxylin, toluidine blue, and other similar basic dyes.
Origin
Late 19th century: toluidine from toluene + -ide + -ine4.