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Thermo-oxidative stability of lac dye was studied by simultaneous thermogravimetry (TG) and differential scanning calorimetry under nonisothermal and isothermal modes in air. The thermal stability change of lac dye was characterized by FTIR and UV–Vis spectroscopy. The TG profiles of lac dye showed at least three steps of mass loss. The first mass loss (about 8 %) found in the range of 40–150 °C mainly...