Blood-red

There was scrawled in blood-red letters a single word— RACHE.

Source: tatoeba (6305999)

Their breasts erect they rear amid the deep, / their blood-red crests above the surface shine, / their hinder parts along the waters sweep, / trailed in huge coils and many a tortuous twine.

Source: tatoeba (6814581)

Reflections of silver moonlight scattered across the dark blue lake, lending her cobalt-blue eyes a pale purple shimmer as he kissed her blood-red lips.

Source: tatoeba (8919955)

The sun went down blood-red, and, in its dying glories, the crescent moon shewed first pale, then glowing; […]

Source: wiktionary