In the erasable ball-point pen ink, the role of the solvent is to dissolve dyes, film-forming agents and to dissolve with various additives, provide a certain degree of fluidity, but also have the right volatility, and can effectively control drying during the writing process speed. Experiments show that the use of co-solvent is better than a single solvent. In this experiment, a co-solvent system with solvent A: solvent B=1: 1.5 to 2.5 is used, which has the best effect.
