Problem was I had a very persistent dark streak. (epicurious.com)
SALT STORY Seasonal water flows might have created dark streaks on Mars» slopes, as seen in this computer - generated view of Hale Crater. (sciencenews.org)
The engimatic region — which the mission team is calling «Sputnik Planum,» after the satellite launched by the Soviet Union in 1957 — also features isolated hills of uncertain height, mysterious pitted terrain and dark streaks of material that may have been deposited by Plutonian winds. (scientificamerican.com)