“…Additionally, Figure S5 revealed LC‐MS spectra of degraded AR dye solution, corresponding to various intermediates at different time of 10, 30, 60, 120 and 180 min (analysis conditions: voltage=135 V, volume=1 μL), while their corresponding retention time were shown in Figure S6. In which, the major degraded fragments confirmed as, 1 (1,4‐Dihydroxy‐9,10‐dioxo‐2‐anthracenesulfonic acid sodium, m/z 342), 2 (1,4‐Dihydroxy‐9,10‐dioxo‐2‐anthracenesulfonic acid sodium, m/z 304), 3 (1,5‐dihydroxyanthracene‐9,10‐dione, m/z 239), 4 (3,6‐Dihydroxyphthalic acid in radical form, m/z 196), 5 (phthalic acid radical, m/z 165) and 6 (CO 2 , m/z 44), similar to reported literature [64–67] …”