any type of opaque water soluable pigment.
The colour of light seen through a diamond without any dispersion, usually viewed through the side of a stone. A diamond's actual colour.
A rather opaque type of watercolour, sometimes used sparingly for emphasis and ornament and sometimes used for the entire image, at which point it is likely called a "gouache."
Opaque oil paint which has the covering power to obliterate underlying colours.
Opaque paint, which is able to eliminate any underlying colours from view. (3)