Inferior hair oil identification method
(1) Low temperature method: If it is placed in the environment of -4 to -6 °C for 8 hours, the phenomenon of condensation occurs when the room temperature is restored, which is inferior.
(2) Specific gravity method: If the single-phase oil is not between 0 81 and 0 88 g/ml, or if the oil phase of the two-phase oil is not between 0 8 1 and 0 88 g/ml, Or if the water phase is not between 0 90 and 1 00 g/ml, it is inferior.
(3) Transparency: If the single phase is unclear at normal temperature, there are impurities and obvious black spots, or if the oil and water phases are not transparent at normal temperature, the fog and dust are inferior. . The identification of the spray can is inferior if it is left at room temperature of -4 to -6 °C for 8 hours.