| Answer | Crossword Clue |
|---|---|
| IBM | AKA Big Blue |
| bluestone | hydrated copper sulphate, aka blue vitriol |
| bluestones | BLUESTONE, hydrated copper sulphate, aka blue vitriol |
| bluebottle | a large fly with metallic blue abdomen, aka blowfly |
| bluebottles | BLUEBOTTLE, a large fly with metallic blue abdomen, aka blowfly |
| odontolite | a fossil bone or tooth coloured blue with phosphate of iron, aka bone-turquoise |
| odontolites | ODONTOLITE, a fossil bone or tooth coloured blue with phosphate of iron, aka bone-turquoise |
