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公开(公告)号：US20220064469A1
公开(公告)日：2022-03-03
申请号：US17418927
申请日：2020-01-03
Applicant: Sanko Tekstil Isletmeleri San. Ve Tic. A.S.
Inventor： Gokhan KAPLAN , Gozde OKTEM , Ertug ERKUS
Abstract: The invention refers to a writing and/or drawing system comprising a pH sensitive dye and a writing material having a pH configured to provide a change in the colour of said dye on said surface of the support, as well as to a method to write and/or draw on the system with the writing material.
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