The invention is a rewritable substrate which can be written by using any common liquid such as water or alcohol, and does not generate any waste or contaminants during writing or wiping. It has great advantages because of the convenience of use and environmental protection.

1.使用一般常見的水溶液如水、酒精即可重複書寫，不需要複雜或有毒的揮發性墨水。
2.擦拭時也不會產生任何廢棄物或汙染物。

In addition to electronic displaying, handwriting devices still play an important role in nowadays society. Therefore, an erasable and rewritable plate has a great potential of education industry.