Rhodamine B (RB)is among the oldest and most commonly used synthetic dyes that
have been recently identified as possible illegal additives in food
from European and China It belongs to the class of xanthenes dyes, a basic
red cationic dye which is highly soluble in water, methanol and
ethanol. Initially, it was used widely as a colorant in textiles and
plastic industries, and is also a well-known fluorescent dye applied
in industry, analytical chemistry and biological studies.