The lower part of the body goes in to a blue-black colour.

As they receded, Mark could see more of the blue-black color which dimmed the sky straight above.

This comes from the blue-black colour of its sides.

The water in the basin turned a blue-black color.

The seawater was the deep, blue-black color that is seen only in the autumn months and presages the coming of the winter storms.

In the presence of amylose, a blue-black color will be observed.

The blue-black color and orange abdominal band cause it to be confused with the female of the more common Peachtree borer at times.

It stains the proteins in blood a blue-black color.

It is easily recognised because of its blue-black colour and bright turquoise marginal line.

The center portion of their pelvic fins is a dark blue-black color.