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Nature grind pen can get the juice from natural material such as leave，petal，clay.The juice can be used to being pigment in the water color pen.Many children from the poverty area have to abandon their talents just because they can not afford the painting material. At the same time, we almost forget the natural pigments extracted from plants which can be made fully use of in a large number.1/ make full use of natural resource which is easily to get everywhere.2/provide opportunities for more children to show their talents.3/Low carbon and Eco-friendly