About this item When you need to add ink, the watercolor pen does not need to add paint, just fill it with water. Each watercolor pen can be reused by adding water, and the use of the pen will not be deteriorated due to the addition of water. Thewatercolor pen can be used by opening the pen cover, which is safe for the human body, and does not stain the child's clothes with dyes when painting. In order to make it easier for children to grasp, thewatercolor pen adopts a small shape and weight design. Thiswatercolor pen is the main accessory forwatercolor painting pads and painting books commonly used in the market, and is suitable for most commodities.