Abstract: A method for testing a POS machine is applied to the test terminal and includes: obtaining sample data of a magnetic track; outputting a first test level according to the sample data of the magnetic track and generating a magnetic field that varies over time according to the first test level; and obtaining a first operation result generated by a POS machine under test and obtaining a test result of whether the POS machine under test can perform a card swiping operation normally according to the first operation result. The first operation result is an operation result which is generated by the POS machine under test according to an electromagnetic induction effect generated according to the magnetic field that varies over time. By performing the method, operational complexity of testing of the POS machine can be reduced, and the efficiency of testing of the POS machine can be improved.

Abstract: A waterproof pigment, the preparing method and the use thereof are provided. The pigment has a primary flake with a layered structure of at least three layers including a top layer, an assembled intermediate layer and a bottom layer, wherein the assembled intermediate layer has at least one layer of active metal. The pigment has a coating on the side of the primary flake only.

Abstract: The invention disclosed a pigment having angle dependence of the interference colors and its production process, in which mica is used as the substrate and the first metal oxide coating with high refractive index has the optical thickness of silver to golden interference color. And the second metal oxide coating with low refractive index has the optical thickness of the second circle green to the fourth circle interference color. The third coating is a highly refractive metal oxide. The lowly refractive metal oxide is SiO2 and the highly refractive metal oxide is TiO2, SnO2, Fe2O3, Fe3O4, CoO, Co2O3, ZrO2, Cr2O3 or their mixtures as well as complexes. The mica substrate is wet-milled mica powders with a thickness of 0.1-0.9 micrometers and a diameter of 5-250 micrometers.

Abstract: A method of preparing a pigment exhibiting a color-shifting effect, including at least heating mica powder suspension in water, adjusting the pH value of the mixture to between 2 and 9, adding a first inorganic salt solution, maintaining the pH value of the mixture constant, stirring the mixture at constant temperature, adjusting the pH value of the mixture to between 6 and 14, adding a second inorganic salt solution, maintaining the pH value of the mixture constant, stirring the mixture at constant temperature, adjusting the pH value of the mixture to between 2 and 9, adding a third inorganic salt solution, maintaining the pH value of the mixture constant, and stirring the mixture at constant temperature.

Abstract: A method of preparing a pigment exhibiting a color-shifting effect, including at least heating mica powder suspension in water, adjusting the pH value of the mixture to between 2 and 9, adding a first inorganic salt solution, maintaining the pH value of the mixture constant, stirring the mixture at constant temperature, adjusting the pH value of the mixture to between 6 and 14, adding a second inorganic salt solution, maintaining the pH value of the mixture constant, stirring the mixture at constant temperature, adjusting the pH value of the mixture to between 2 and 9, adding a third inorganic salt solution, maintaining the pH value of the mixture constant, and stirring the mixture at constant temperature.

Abstract: The invention discloses multilayer allochroic pigments having angle dependence of the interference colors and the production processes thereof, in which a synthetic flake of silicate is used as the substrate, and a metal oxide coating with refractive index of more than 1.8 and an oxide coating with refractive index of less than 1.8 are deposited alternately on a surface of the flake of silicate, the number of the coatings is at least three, and said oxide coating with refractive index of less than 1.8 always lies between two metal oxide coatings with refractive index of more than 1.8. The processes involve a wet chemical hydrolysis step to alternately deposit said oxide coating with high refractive index and said oxide coating with high refractive index on the surface of the flake of silicate. The present pigments, which exhibit different strong interference colors as observed at different view angles, could be produced at a low cost and by a simple process.

Abstract: The invention disclosed a pigment having angle dependence of the interference colors and its production process, in which mica is used as the substrate and the first metal oxide coating with high refractive index has the optical thickness of silver to golden interference color. And the second metal oxide coating with low refractive index has the optical thickness of the second circle green to the fourth circle interference color. The third coating is a highly refractive metal oxide. The lowly refractive metal oxide is SiO2 and the highly refractive metal oxide is TiO2, SnO2, Fe2O3, Fe3O4, CoO, Co2O3, ZrO2, Cr2O3 or their mixtures as well as complexes. The mica substrate is wet-milled mica powders with a thickness of 0.1-0.9 micrometers and a diameter of 5-250 micrometers.