Umbelliferone, also known as 7-hydroxycoumarin, hydrangine, skimmetine, and beta-umbelliferone, is a widespread natural product of the coumarin family.
It absorbs ultraviolet light strongly at several wavelengths. Despite several indications that this chemical is photomutagenic, it is used in sunscreens. Umbelliferone has been reported to have antioxidant properties.[medical citation needed]; It is a yellowish-white crystalline solid that has a slight solubility in hot water, but high solubility in ethanol.

Appearance and properties: gray crystalline powder

Density: 1.403g/cm3

Boiling point: 382oC

Melting point: 230 °C (dec.)(lit.)

Refractive index: 1.64

Water solubility: 1 g/100 mL (100 oC)

Storage conditions: Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Usage:Used as fluorescent indicator and acid-base indicator (pH 6.5-8.0).