Steve Firth wrote:
djc wrote:

That sort of colour is often two tone: to get the right effect (looks
black until a bright light shines on it) you might try painting black
and then covering with a tinted varnish.

Aubergine when done in two-tone paint is IIRC done with a blue basecoat
and a red transparent varnish.

Yes, that sounds right, filter out the red, reflect off the blue base,
filter out some more red: result near black apart from some refraction
through the top coat.

--
djc