Most printers only print in black and white, and therefore chart making in
Excel is very much geared towards making charts in B/W instead of in colors.

Therefore, it is problematic that Excel only offers colored charts as
defaults, and also that that the options for B/W-charts (line styles, bar
filling etc) are much too few in comparison with other software. Hence, I
suggest the following:

1) That Excel offers the user two variants of default chart templates: one
in color and one in B/W. For the B/W, a set of complementing styles and
shapes should be carefully chosen by the Excel team.

2) That the number of styles and variants for making B/W-charts is heavily
increased. Now there are only 5 line styles and 4 line weights. The first of
these could well be multiplied by four, i.e., offering 20 line styles!

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http://www.microsoft.com/office/comm...excel.charting