  We present a method for computing the framing on the cohomology of graph
hypersurfaces defined by the Feynman differential form. This answers a question
of Bloch, Esnault and Kreimer in the affirmative for an infinite class of
graphs for which the framings are Tate motives. Applying this method to the
modular graphs of Brown and Schnetz, we find that the Feynman differential form
is not of Tate type in general. This finally disproves a folklore conjecture
stating that the periods of Feynman integrals of primitive graphs in phi^4
theory factorise through a category of mixed Tate motives.
