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Print screenshots to a black and white printer and confirm that all information is visible.
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Test applications using only black and white, high-contrast settings and confirm that all information is conveyed correctly.
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Test that the application provides at least three combinations of color schemes and that high-contrast schemes are available (e.g. white on black or yellow on blue).
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Turn on high-contrast settings in the GNOME Control Center and confirm that the application respects these settings.
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Test various themes to ensure that the software is working for all the available settings.
