Rhodamine B

Molecular Formula: C28H31N2O3Cl

Molecular Weight: 479.02 grams per mole

CAS Number: 81-88-9

SMILES structure:

Rhodamine B is used in biology as a staining fluorescent dye, sometimes in combination with auramine O, as the auramine-rhodamine stain to demonstrate acid-fast organisms, notably Mycobacterium.

Rhodamine B is tunable around 610 nm when used as a laser dye.

Rhodamine B is also called Rhodamine 610, C.I. Pigment Violet 1, Basic Violet 10, or C.I. 45170.

In California, Rhodamine B is suspected to be carcinogenic and thus products containing it must contain a warning on its label.