How does one make a rare item with only one mod?

A thing I'm pretty curious about.

Apparently it is possible to make items like this:

http://www.pathofexile.com/forum/view-thread/1195616

That's Lapiz's build guide for his ele shadow for LLD. If you look at his gear you'll see his chest has one mod, and 5 master crafted mods.

Anyone have any idea how to do this?
Theorycrafter/Build Creator for PORTAL guild
@BlightScourge -> guide @ view-thread/1382667 (Retired till Mjolner is fixed)
Lvl 94 Crit Mjolner Marauder
twitch.tv/savagewolves
Master mod, remove master mod when yellow.
IGN: Chundaziri
8/8 Ambush/Invasion Complete - 21/06/2014
8/8 Warbands/Tempest Complete - 10/08/2015
Didn't know you could master mod a white item and make it blue (tested it myself after your post).

Good to know this isn't as expensive as I thought it might be.

Solution found:

1. Add master mod.
2. Regal
3. Remove master mod.
Theorycrafter/Build Creator for PORTAL guild
@BlightScourge -> guide @ view-thread/1382667 (Retired till Mjolner is fixed)
Lvl 94 Crit Mjolner Marauder
twitch.tv/savagewolves

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