It depends on how often you use the brush, but it still doesn't apply for a long time. I want to write calligraphy today.
Immerse the brush in water to soften the hair of the brush, and consider the quality of ink.
Dipped in water, the written words are still very black, don't worry. For example, grinding ink is to use a water mill.
Ready-made ink, just the right color. The color becomes lighter after adding water. Wash the brush with water, spin it dry and then use it.