Proposed color-color diagram that breaks the degeneracy between bare-rock and thick oxidized stable atmospheres. The combination and names of the three employed JWST/MIRI photometric bands are shown on the axes. A set of bare-rock surface material scenarios is represented by colored stars (⋆). The various shapes indicate values across our grid of surface pressures, with colors representing the oxygen fugacity values. Blue represents reduced conditions and red represents oxidized conditions. Finally, we overplot different graphite activity (a_c) values with different symbols (see legend: †, +, ×, and *) at random surface pressures. The shadowed areas represent the KDE probability density of the bare-rock and stable-atmosphere clusters.