Discovered in 1887, it is still used as a staining fluorescent dye in biological science. Rhodamine B is a toxic fluorescent dye but prepared as a lake is harmless. Rhodamine B can be mixed with quinacridone magenta (PR122) to make the bright pink watercolor known as Opera Rose.
Manufacturer/ product code: CAS 509-34-2
Chemical Description: C28H31ClN2O3
Color: red
Color Index: PR 173
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