Keying a Painting - No. 49

How Paul approaches the keying of paintings to produce best possible light effects and general tonality.

In response to Richard.

QUESTION: I would like to ask something about keying a painting, especially if the subject contains say a very reflective highly colored object well out of the range of paint. Say a copper plate with a highly colored light area or even a white object with highlights. Would you paint it as light as possible while retaining some of its color quality and scale down to the darkest dark from that? Richard