As he touched the texture, he was surprised because it was different from a normal piece of paper. A normal piece of paper, no matter how smooth would still have a trace of roughness on it.
However, this piece of paper was so smooth that Saito felt it slipping through his fingers. He applied some magic within this piece of paper however, nothing happened at all.
Even though nothing happened, he couldn't place the feeling at rest that something was wrong with this piece of paper. He closed his eyes and asked Iris 'Iris, scan this piece of paper and show me the results.'
[Master, this piece of paper was recently used as a carrier for great amount of magic.]
It confused Saito as he heard Iris 'Carrier for great amount of magic? Then why can't I sense any magic coming from this piece of paper?'