Black in some form if I'm not mistaking
A key is a group of notes upon which a scale is based. A key is identified by it's key signature, which shows the number of sharps or flats in the scale. a key is named after it's keynote (the first note in the scale), for example F major's keynote is F.
Caravaggio
created drama through an intense use of light and dark and focused on naturalism
though Caravaggio use in The Conversion of Saint Paul used foreshortening to
bring the figure to the front of the painting and project him into the viewer's
space.