| Answer | Crossword Clue |
|---|---|
| CARBONFOOTPRINT | Dark gray piece of evidence for a tracker? |
| plumbago | very common mineral, soft native carbon, occurring in black to dark-gray foliated masses, with metallic luster and greasy feel: used for pencil leads, as a lubricant, and for making crucibles and other refractories; plumbago; black lead |
| touchstone | A piece of fine-grained dark schist or jasper formerly used for testing alloys of gold by observing the color of the mark that they made on it |
| touchstones | A piece of fine-grained dark schist or jasper formerly used for testing alloys of gold by observing the color of the mark that they made on it |
