Having cover power; not permitting the prepared surface or other colors to show through or other colors

Color which does not allow other colors to show through.

change this color to the pen color within the image

refers to nontransparent color.

a gene that causes a milk like thick layer of pigment to be present, which makes the color turn 'opaque' as in 'not see through'. This gene, combined with a few others was essential in creating the white opaque strain. White opaques are now a day referred to as simply "opaques", as they are by far the most popular of all strains that derived from the opaque gene. Nonetheless "opaque" is not a color, it is a trait.