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Web Accessibility: Color
Maximize Color Contrast
For Text: Consider these suggestions when choosing color schemes:
- Black on white is the most legible; white on black is reasonably legible; other colors on black are less legible.
- Mixing yellow and black is fairly legible.
- If using red or green text, make it large and bold enough to be legible in yellow.
- Black on red and black on green are not legible, as some people will see them as black on black.
- Combining blue and black is legible enough as long as it is not used for fine detail (e.g., paragraph text).
- Combinations such as red-blue, green-yellow, green-white, green-gray (MS Windows "button gray") are poor because they have small brightness contrast and because red/green color blindness is the most common.
- Avoid highly saturated backgrounds.
To test whether color contrast is sufficient to be read by people with color blindness or by those with low-resolution monitors, print pages on a black and white printer (with backgrounds and colors appearing in grayscale). Photocopy the copy two or three times to see how it degrades.
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