The THEMIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations of the surface not easily identified in a single band image. Today's false color images shows an unnamed crater in Noachis Terra. The "dark blue" material is probably basaltic sands. Orbit Number: 17811 Latitude: -77.9919 Longitude: 0.491743 Instrument: VIS Captured: 2005-12-19 20:35. http://photojournal.jpl.nasa.gov/catalog/PIA20225