about wall materials

For new studio's room, I had to choose a material of wall (already done now). So I tried to check some scraps for the tests: ①whether the Sumi-ink can be wiped off, ②whether or not it will be able to do "lining(Ura-uchi)". The "lining" is an final process in the creation of a Shodo work. If the wall doesn't have a power of stick paper with glue, it is not suitable for the new room's wall.

Results of the tests!

①both are OK.

②On the left one, paper peeled off in one hour. The right one is the perfect! (could keep 3days).

I thought they were both the same, but the fact is not. It is not obvious at first glance!