1) Color of ink;
(2) The viscosity of ink;
(3) The absolute viscosity of the ink, measured in poise or centipoise as a unit of fluid viscosity. It can be obtained by comparing the outflow time of falling ball viscosity fluid in capillary viscometer;
(4) The adhesion of ink;
(5) The dryness of ink;
(6) The coloring power of ink;
(7) Ink fineness;
(8) The fluidity of ink;
(9) The acid and alkali resistance of ink. Determination of ethanol resistance