If you use color to convey meaning, there must also be another way that meaning is conveyed so that people who are color blind can still access the information. If red text is used on a white background, be sure to use a dark red to ensure proper color contrast. Red text also has a low contrast level between the text and most backgrounds. Red-green color blindness is the most common form of color blindness. A common example of this issue is using the color red to indicate important information. When the importance of information is communicated using color alone, then that importance is not conveyed to people who are blind or color blind students and cannot see the color of the text. Watch an example of colors with good contrast. Low contrast sensitivity also becomes more common for all people as they age, so using high contrast will help make your materials more effective for a wide range of users. Insufficient contrast especially can be an issue for people with color blindness because they can't distinguish between certain colors (such as red and green).
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