The invention discloses a manufacturing process of a high
alumina-
silica glass square
flash point effect, which comprises the following steps of: (1) preparing a high
alumina-
silica glass square flashpoint effect
etching solution, and putting the
etching solution into an
etching sand spraying device; (2) carrying out silk-screen covering protection on one surface, which does not need to be etched, of a
mobile phone rear shell original sheet made of a high
alumina-
silica glass material by using anti-etching ink; (3) cleaning and air-
drying one surface, which needs to be etched, of the
mobile phone rear shell original sheet made of the high alumina-silica
glass material, and putting the original sheet into the etching sand spraying device in a dry state to carry out sand spraying etching treatment; and (4) taking out the etched
mobile phone rear shell original sheet made of the high alumina-silica
glass material from the etching sand spraying device,
polishing the mobile phone rear shell original sheet with a
polishing solution, cleaning the mobile phone rear shell original sheet, and finally air-
drying or
drying the mobile phone rear shell original sheet. According to the invention, frosting etching treatment is carried out on the mobile phone rear shell made of the high alumina-silica
glass material, a layer of square columnar
microcrystalline particles with micron-sized thickness is formed on the surface of the glass, and the surface of the glass has a
starlight flickering effect under the condition of facing light.