(1) A piece of square glass with a mass of ≈0.15 g, the glass piece having a side length of 20 mm and a thickness of 2 mm. (2) 10g weight one. (3) The newsprint is cut into 15cm x 11cm. (4) Ink knife and squeegee. (5) Timekeeping clocks.
Test method (1) The ink to be tested is placed on the newsprint paper with a dipstick knife in a small amount, and the ink is scraped into a thin layer with a squeegee from top to bottom. The ink thin layer scraped is about 4 to 5 cm in width and about 12 cm in length. (Not shorter than 10cm). (2) Record the time of good ink scraping. Place the scraping paper on a smooth glass plate (ink sample up) after 15 minutes. The top part is covered with another blank newsprint paper, and a square glass piece and a weight are pressed on the scraped end of the paper strip. (3) Quickly grasp the other end of the blank news note and move it along the direction of scratching to make the newsprint rub against the scratch under the pressure of the glass sheet and the weight. (4) Check if the newsprint paper is stained. If it is still dyed, repeat the above test at a different position with a new newsprint at a certain time afterwards until the newsprint is not dyed after the test. Then calculate the ink smear until the newsprint after the test. The time required for no dyeing is the drying time.