“…[2][3][4] Nowadays, indigo obtained from inorganic salts has not lost its importance because it offers better stability, especially oxidation resistance, compared with organic pigments. 5 However, research on the solubility of inorganic compounds might play an essential role to unlock the physical and chemical aspects of thermodynamics and kinetics of the molecules microscopically, hence this understanding may be helpful for future advanced research, such as in nanotechnology, [6][7][8] nanophotonics, 9 nanocoatings, 10 solar cell fabrication, 11 membrane therapy, 12 drug delivery to cancer cells, anti-counterfeiting material coatings, 13 optical sensors, 14 etc. In addition, the dissolution of inorganic pigments into microemulsions potentially has a bright future, as it can be applied in the pharmaceutical industry and in the conversion of light into energy, solar cells, sensor technology, and photonics.…”