Is it good to strike through visited links?

1. Should visited links be a different color?
2. What Colour should hyperlinks be?

Should visited links be a different color?

Display Content Clearly on the Page

Use blue for unvisited links and purple for visited links unless you have a reason to choose different colors. Test your color choice to make sure it stands out from the body text—and that it's visible to people who are color blind.

What Colour should hyperlinks be?

Shades of blue provide the strongest signal for links, but other colors work almost as well. As always, when using color to signal information, you should provide redundant cues for color-blind users. Making unvisited links brighter and more luminous than visited links will usually accomplish this goal.