From Jakob Nielsen's Alertbox (Usability Expert)
Quote:
"Textual links should be colored and underlined to achieve the best perceived affordance of clickability, though there are a few exceptions to these guidelines....
Use different colors for visited and unvisited links. "
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Reference:
Guidelines for Visualizing Links
Usability.gov
Quote:
"Use color changes to indicate to users when a link has been visited....
Generally, it is best to use the default text link colors (blue as an unvisited location/link and purple as a visited location/link). Link colors help users understand which parts of a Web site they have visited...."
page 8
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Quote:
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"Provide sufficient cues to clearly indicate to users that an item is clickable." page 9
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The above quotes are from the Usability.gov's
Links chapter (opens a PDF file)
Users scan and also learn by repetition.
In your example, if I scanned, you established that the links are orange in the first section. After that, I'm going to look for orange wording when looking for links.
Your orange links also don't have a visited colour, as recommended by both of the above references.