Bought some colored card stock when I got groceries last night, and decided to put it to the test. I didn’t realize the first pack had a pearl finish to it or I would have passed on it. In my experience those usually have a coating that doesn’t play nice.
Although pencil does smudge a little when erasing, it actually took ink better than I expected. Not going to be my first choice, but it’s interesting. I don’t think you can really tell from the photograph, but the pearl effect actually shows through the ink.
The second set was normal cardstock, which I draw on a lot so nothing special there. Just figured might as well draw on it while I was testing.