Related Clues:
- Hard glossy surface
- Material detectable in the ground
- Element eg for road or rail
- Element such as iron, copper, zinc etc
- Lead or iron, perhaps
- Hard, glossy protective coating
- Chopper coating?
- Vitrified coating for metal etc
- Gloss paint
- Solid material, a good conductor of heat and electricity
- Iron, gold or silver, for example
- Vitrified coating
- Coating for a tooth
- Dental coat
- Nail varnish