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This is a pen designed for social vulnerable children for painting. They smell and can rapidly distinguish the color of the pen. As long as the fragrance disappeared, this indicates the pen is running out of ink.
This design uses the smell to rapidly distinguish the colors and the ink level. It prevents the social vulnerable children from entailing strenuous effort to distinguish the colors.
Wufeng Dist., Taichung City, Taiwan
Hsuan Lin Ying,