what is this?

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Across
  1. 2. color of .. wealth
  2. 3. color of..
  3. 6. egg
  4. 9. color of night sky
  5. 10. color of metal?
Down
  1. 1. color of sea
  2. 2. color of tree
  3. 3. dawn of sky
  4. 4. a sign of warning
  5. 5. hermes..
  6. 7. color of old people's hair
  7. 8. similar with white..
  8. 9. color of tree