  There has been much recent interest in long-lived massive particles at the
LHC, understood as those with lifetimes between tens of micrometers and several
meters. In this context we consider the possibility of long-lived electroweak
singlet scalars charged under colour $\mathrm{SU}(3)$ with masses near a TeV.
The shortest lifetime of interest is already longer than typical hadronisation
scales. These exotic new particles would therefore appear as colour singlet
bound states of the new scalars with quarks and gluons and it is their colour
charge that prevents them from decaying. In particular we consider colour
representations consistent with maintaining asymptotic freedom, those with
dimensionality $d_R \leq 15$. We find that only the octets can decay, and they
do so into multi-jet final states through the two-gluon channel. The other
representations are stable and form fractionally charged colour singlets, with
the decuplet being the only one that can form electrically neutral colour
singlets.
