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We have explored the properties of a peculiar object detected in deep opticalimaging and located at the tip of an HI tail emerging from Hickson CompactGroup 16. Using multiband photometry from infrared to ultraviolet, we were ableto constrain its stellar age to 58$^{+22}_{-9}$ Myr with a rather highmetallicity of [Fe/H] = $-$0.16$^{+0.43}_{-0.41}$ for its stellar mass ofM$_\star$ = 4.2$\times$10$^6$ M$_\odot$, a typical signature of tidal dwarfgalaxies. The structural properties of this object are similar to those ofdiffuse galaxies, with a round and featureless morphology, a large effectiveradius (r$_{eff}$ = 1.5 kpc), and a low surface brightness (<$\mu_{g}$>$_{eff}$= 25.6 mag arcsec$^{-2}$). Assuming that the object is dynamically stable andable to survive in the future, its fading in time via the aging of its stellarcomponent will make it undetectable in optical observations in just $\sim$2 Gyrof evolution, even in the deepest current or future optical surveys. Its highHI mass, M(HI) = 3.9$\times$10$^8$ M$_\odot$, and future undetectable stellarcomponent will make the object match the observational properties of darkgalaxies, that is, dark matter halos that failed to turn gas into stars. Ourwork presents further observational evidence of the feasibility of HI tidalfeatures becoming fake dark galaxies; it also shows the impact of stellarfading, particularly in high metallicity systems such as tidal dwarfs, inhiding aged stellar components beyond detection limits in optical observations.

A diffuse tidal dwarf galaxy destined to fade out as a "dark galaxy"