We present the detection of visible light from the planet TrES-2b , the darkest exoplanet currently known . By analysis of the orbital photometry from publicly available Kepler data ( 0.4-0.9 \mu m ) , we determine a day-night contrast amplitude of 6.5 \pm 1.9 ppm , constituting the lowest amplitude orbital phase variation discovered . The signal is detected to 3.7 \sigma confidence and persists in six different methods of modelling the data and thus appears robust . In contrast , we are unable to detect ellipsoidal variations or beaming effects , but we do provide confidence intervals for these terms . If the day-night contrast is interpreted as being due to scattering , it corresponds to a geometric albedo of A _ { g } = 0.0253 \pm 0.0072 . However , our models indicate that there is a significant emission component to day-side brightness , and the true albedo is even lower ( < 1 % ) . By combining our measurement with Spitzer and ground-based data , we show that a model with moderate redistribution ( P _ { n } \simeq 0.3 ) and moderate extra optical opacity ( \kappa ^ { \prime } \simeq 0.3 - 0.4 ) provide a compatible explanation to the data .