White Balance n exposure using copy stand

Depending on what type of artwork you are shooting there is always a possibility that the colours are beyond what the camera can capture. If this is something that you are going to be doing on more that a once off it might be worth picking up a Colorchecker card or passport, that way you can balance the colour and profile your camera at the same time, you are almost guaranteed accurate colour.

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Chris.
A weather sealed ultra wide, is that too much to ask?
http://www.pentaxphotogallery.com/chriside
GMT +9.5
Pentax SLR talk FAQ
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