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Why are there scratches on colored paper?
Thermosensitive reaction.

It is possible to use heat-sensitive paper. Heat-sensitive paper nails generate heat by scraping, so scratches will appear.

Colored paper is a general term for white signature boards, with a common size of 24CmX27Cm. The popular colored paper collections in Japan are basically based on the works of famous illustrators, original paintings, cartoonists and original cases. Mainly draw characters+signatures.