FIGURE 2.

Photostability and bleaching rate of the dye extract (CM) of calyces of Hibiscus sabdariffa in different solutions and light illumination of 5 Mw/cm². (a) Absorption spectra of the photostability study of the dye extract in dH2O. (b) Absorption spectra of the photostability study of the dye extract in Acetate‐HCl buffer (pH 4.6). (c) Absorption spectra of the photostability study of the dye extract in Phosphate Buffer Saline (pH 7.2). (d) Absorption spectra of the photostability study of the dye extract in Tris Base‐HCl buffer (pH 8.6). CM, cold methanol dye extract