DSanai has added this functionality into his mod, Auction FilterPlus.
I have decided to leave this mod as a lightweight version and recommend checking out DSanai's mod. It has much more flexibility than this one currently has.

Zyph

Colors "Already Known" Auction Items. You can know at a glance which items you don't know at a glance.

Original Author: Merrem - http://www.curse-gaming.com/mod.php?addid=592 - Last Updated: 4/2/2005 - Last Version: 1.03
Merrem - http://ui.worldofwar.net/ui.php?id=557 - Last Updated: 4/2/2005 - Last Version: 1.03

Revised Author: dns13 - http://www.curse-gaming.com/mod.php?addid=689 - Last Updated: 3/23/2005 - Last Version: 1.2

Expanded Author: Zyph - zyph@zyph101.net

Expanded Description:
I noticed that this Addon had not been updated in some time. Taking the original 2 authors design and code, I expanded it
somewhat to:

1. Update the Addon for the 1.8.1 patch.
2. Added new colors (Gray and Black).

NOTE: 90%+ of the code in this version should be credited to the original authors of the Addon.


Future Development:

I really don't want to add a lot to this Addon. It runs well and there are many Addons these days for the AH.
I am planning to look into the following, but have no release date yet:

1. Remove the "Already Known" Items from the list entirely, thus leaving only the items you can use.

2. I'll look into what it will take to make this work with ALTs.
3. Add a Color Picker, so that you are not limited to a few colors.

Usage:
/fk - Help
/fk <color> - Changes the "Already Known" Items to be colored.
Available Colors: green, blue, red, gray, black

If anyone would like to help with translation, please let me know.

Required	Optional
	myAddOns

1.3 Updated TOC for 1.12.0 Patch