Supplied in glass jars.
 
Fluorescein isothiocyanate, isomers 1 & 11, are fluorescent dyes used for various applications in biological research.
 
The CAS number for this product is 3326-32-7, and its molecular weight is 389.4 g/mol.
 
As with all fluorescent dyes, this product should be handled with care, and its Material Safety Data Sheet (MSDS) should be closely followed. The MSDS includes hazard warning codes such as H302 (harmful if swallowed) and H315 (causes skin irritation). 
 
Fluorescein isothiocyanate, isomers 1 & 11, are commonly used as labeling agents for various biological molecules, including antibodies and proteins.