Pen opening: when you use the pen for the first time, place the pen in warm water or use your fingers to gradually and carefully rub the pen from the tip to avoid damage to the pen. Note: a small amount of floating hair will appear during the first use, and this phenomenon will disappear later. Pen moistening: before using the used pen again, soak the pen head with clear water, and then vertical hanging the pen for a while to restore the toughness of the pen, which is beneficial to writing and painting. Ink input: use the writing brush after soaking vertical hanging to touch ink. Note: it is appropriate to touch ink in three points. If there is less ink, the pen cannot run freely, and if there is more ink, the waist will grow soft and weak.