Alizarin Orange Red CAS 72-48-0 Pure Lab Grade

Alizarin Red 1,2-dihydroxy-9,10-anthraquinone

Reagent Name: ALIZARIN
Reagent name: Alizarin
Synonyms: 1,2-dihydroxy-9,10-anthraquinone
Summary formula: C14H8O4
Molar mass [g / mol]: 240.21
EC number: 200-782-5
CAS Number: 72-48-0
Type: pointers
Appearance / form: orange powder

Alizarin Orange produces bright, orange needles or plates when precipitated from an acetic acid solution. It is used to dye cloth orange with an alum mordant or a red to violet color when used with an iron mordant. Alizarin orange is also used as an acid-base indicator. In aqueous solutions, it changes from an orange at pH 2.0 to a yellow at pH 4.0. In a saturated alcohol solution, alizarin orange changes from yellow at pH 5.0 to a purplish red at pH 6.5.