Which metallic element imparts a red colour to corundum?

The metallic element, used to prepare dental amalgams, can also affect the digestive tract, but only in large amounts.

These colours were produced by adding layers of metallic element oxides and firing them at 750 to 800 degrees celsius.

The two most useful properties of the metal are corrosion resistance and the highest strength-to-density ratio of any metallic element.

Here, vibranium was seen to be an unusual metallic element with decidedly strange properties.