I think he would like purple too.
Max doesn't even notice that they are on. He's pretty observant. He doesn't like when people touch his tail or back end and if he even feels a slight breeze (from you walking by) he will hiss at you.

That is why I'm shocked that he doesn't mind the claws. I'm sure that he knows they are there but he has not once tried to chew them. He doesn't even groom them any more than he did his regular claws. When we first put them on, I only put on one and then let him go to see if he'd react and he didn't. So, I put the rest on and he just walked away like nothing happened.
