ultramarine

Ultramarine pigment The pigmented cyan panels to be examined will be passed back and forth between two clear PVC sheets and placed in an oven at 70°C for 72 hours, graded according to the contamination of the uncolored PVC sheets. Respect for migration, level 1; Significant migration, level 2; There is migration, level 3; Slight migration, level 4; No migration, level 5. 5. Oil resistance The group cyan pulp of the test color was placed on the rapid qualitative filter paper, and when the infiltration ring penetrated to 2cm at the outer edge (flax seed oil was taken as the control sample), the grey classification and grading of the infiltration ring control were observed. Best level 5, worst level 1. 6. Water resistance 0.5 g ultramarine pigment and 20 ml distilled water were placed in a stoppered test tube, oscillated for 5 minutes, and subjected to vacuum filtration. The color filter degree of the filtrate was observed and then classified according to the color filter gray classification. Best level 5, worst level 1. 7. Acid resistance 0.5 g ultramarine pigment, 20 mL, and 2% hydrochloric acid solution were placed in a stoppered test tube, shaken (for the control sample, and distilled water was placed therein) for 5 minutes, subjected to vacuum filtration, and the filter cake was rated against the color-changing sample, and the filtrate was rated against the color-changing gray sample. Represented by A[B], A filtrate color grade, and B filter cake color grade. Best level 5, worst level 1. 8. Alkaline resistance