User blog comment:Rahv7/A bit of redesign for the wiki/@comment-92.72.238.8-20180813161245/@comment-50.101.88.115-20180814033109

Rahv7 - One page which causes the effect is "The Inks of the Undernight", here: http://fallenlondon.wikia.com/wiki/The_Inks_of_the_Undernight

There are others IIRC but that's the only one I have to hand.