  If the length scale of possible extra dimensions is large enough, the
effective Planck scale is lowered such that microscopic black holes could be
produced in collisions of high-energy particles at colliders. These black holes
evaporate through Hawking radiation of a handful of energetic particles drawn
from the set of all kinematically and thermally allowed degrees of freedom,
including dark matter. Here, we perform the first numerical black hole
spectroscopic study of the dark sector. We find that if the next generation of
colliders can produce microscopic black holes, then missing momentum signatures
can reveal the existence of any new light ($\lesssim 10$ TeV) particle,
regardless of the strength of its coupling to the Standard Model, even if there
exists no such non-gravitational coupling at all.
