Related Clues:

• Showing signs of aging
• Slate-colored
• Confederate color
• Anatomist Henry
• Like a foreboding sky
• Black plus white
• Pre-dye shade, perhaps
• __ matter
• Like catbirds and koalas
• Blue opponent
• Not clear-cut
• CSA uniform color
• Black and white
• Some people are dying to hide it
• See 4 Down