Related Clues:

• Steel-gray metallic element
• The 'Ba' of BaSO4
• Horse takes in barium and turns a vivid shade of blue
• A blue color
• Carbonates of this element and calcium create hard water
• Element in blue glass
• Reactive earth metal
• Co-pilot finally completes putting fuel over nose of Boeing
• Bright blue shade
• A commissioned officer briefly trampled on by horse becomes blue
• Magnetic element
• Element Co
• Element that's key on horse
• The old woman hugging girl, one member of a second group
• Friend twisted dial — not sure it's heavy metal