Sorry, I've never used it for double-sided printing and I can't check because I'm abroad. I've used it for printing and distributing photos here and there (i.e. not for archiving raw photos prints) and for that purpose, this paper is top notch.
Not suitable for double-sided printing. Firstly, the main paper side is lighter and the ink print is more precise and secondly, there is a risk of the paper curling with double-sided printing. Greetings Max