About one in twelve men and one in two hundred women have some form of color blindness. That is a real slice of your customers. If your website uses color alone to tell people something important, those customers miss it completely. Here is where this quietly bites businesses, and how to fix it. 1. Links that are only a different color. If your links look like normal text except they are blue or green, a color blind visitor cannot tell they are clickable. Underline your links, or make them clearly stand out in more than one way. Color plus an underline beats color alone. 2. Error messages shown only in red. A contact form that turns a field red to flag a mistake leaves out anyone who cannot see the red. Add words. "Please enter a valid email" next to the field tells everyone what went wrong, no color required. 3. Required fields marked only by color. Same idea. Use a word or a clear symbol with a label, not just a color, so people know what they have to fill in. 4. Charts, maps, and status dots. Open, busy, closed, available, sold out. If the only difference is green versus red, add a label or a shape. Never make color the only way to understand something that matters. 5. Buttons that blend in. A button that is only slightly different from the background is hard to find for many people. Give it strong contrast and clear edges so it reads as a button to everyone. The simple rule to remember. Color can support your message, but it should never be the only thing carrying it. Anything important needs a second signal too, a label, a shape, an underline, or text. Here is a quick check. Imagine your website printed in black and white. Can you still tell the links, the buttons, the errors, and the important bits apart? If yes, you are in good shape. If not, you found your fix list. Goggles On. Let's Ride.