YellowI

YellowI is a chemical compound with the molecular formula C19H17N3O2. It is a yellow crystalline powder that is soluble in water and ethanol. YellowI is a derivative of indigo, a natural dye, and is used as a pH indicator. It changes color from yellow to red in acidic solutions and from yellow to blue in basic solutions. This property makes it useful in laboratories for titrations and pH measurements. YellowI is also used in the textile industry as a dye and in the food industry as a colorant. It is generally considered safe for use in food and cosmetics, but like all chemicals, it should be handled with care. The compound was first synthesized in the early 20th century and has since been widely studied for its chemical and biological properties.