1, the principle of inspection
After the ink is placed on the filter paper for a certain period of time, it is observed whether the filter paper absorbs ink on the oil ring that is oozing out of the filter to check the bleeding of the ink.
2, tools and materials
(1) Ink transfer knife;
(2) qualitative filter paper.
3, inspection methods
(1) Fully stir the test ink with a knife and place a small amount on the qualitative filter paper.
(2) Observe the infiltration color around the ink after 1 hour. The oil ring that seeps out is not blue, yellowish brown or other colors.
Source: 21st Century Fine Chemicals Network
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