Currently, when you visit the notifications page, theres nothing that tells apart which notifications were new and which you already read. All you know is how many new notifications you had before visiting the page (but if that number was 50 you can't really count in head how many you glaced through).
I really like the idea that all old notifications can be found later, but new ones could instead be marked with a lighter background colour for example. There could be two ways to tackle the feature:
1) A button you click to "mark all as read".
2) After visiting the page once the new notifications are automatically marked as read and appear like the rest the next time you visit the page.
Customer support service by UserEcho