i think it is smaller = lighter, Eric.
the 'scale effect" articles i have read always indicate that.
i believe the theory is that the smaller scale is like being farther from the subject,
which in turn mutes and 'fades' the colors.
this is the link to the pdf (you need Adobe Acrobat to read) dealing w/ scale effect
from Testors website:
http://www.testors.com/tes_cds/hobby_guides/08%20Special%20Effects.pdf
for those w/ out Adobe (get it, it's free you know!) or don't want to read it,
here is a summary:
scale______________percentage of white to add
1/32 & 1/35________________7-10%
1/48_____________________10-25%
1/72 & 1/76_______________15-30%
1/87_____________________20-35%
1/144____________________23-38%
the article points out that these ranges are a consensus,
and that 'color' is a very subjective thing, varying from viewer to viewer.
i really recommend this resource.
here is the link to the testors page w/ all the modeler's guides:
http://www.testors.com/hobbyist_guides.asp
i admit that Robert has a point, in that after all the washes & weathering,
it is debatable how beneficial this 'scale effect' is.
i like to lighten mine just so the dark washes that follow don't make my models
'too dark'. considering the endless argument over what most of these colors
'really' looked like, you are probably safe either way.
ed.
ed.