Hi JlClLlEl,
Thanks for your post in Apple Support Communities, we understand that you'd like a specific web site to show links that you've clicked on in the past in purple instead of blue in Safari on your iPhone. We've got some questions so we can better understand the issue.
Does this only happen on estatesales.net, or does it happen on other sites as well?
What iOS version are you running? You can check using Find the software version on your iPhone, iPad, or iPod. If your software needs to be updated, try using Update your iPhone, iPad, or iPod touch to update.
Do you have private browsing turned on? You can check using Browse privately in Safari on iPhone.
Let us know and we'll go from there.
Cheers!