As of 6.2.2, item level 715 is the maximal upgrade that can be performed on these items.

*UPDATE for June 23, 2015* - 不穩定的強效光潔精華劑 and 不穩定的特強光潔精華劑 can no longer be crafted. Pre-patch 6.2 upgrade items (created before the patch) can be deconstructed to create the following:

Item	Deconstructs to:
不穩定的光潔精華劑	光潔精華劑 + 15 X 術法之土
不穩定的強效光潔精華劑	光潔精華劑 + 25 X 術法之水
不穩定的特強光潔精華劑	光潔精華劑 + 25 X 術法之水

As of 6.2, the new initial upgrade item will be 光潔精華劑 (used for any and all upgrades until Stage 4). The upgrade items required for each stage are listed below:
Stage 1 to 2 (Item level 640 to 655) - 光潔精華劑
Stage 2 to 3 (Item level 655 to 670) - 光潔精華劑
Stage 3 to 4 (Item level 670 to 685) - 光潔精華劑
Stage 4 to 5 (Item level 685 to 700) - 強力光潔精華劑
Stage 5 to 6 (Item level 700 to 715) - 野蠻光潔精華劑

**Note that 3 separate 光潔精華劑 items are required to get from Stage 1 to Stage 4.**

Item

Materials

Recipe

光潔精華劑	70 X 光潔皮革 15 X 術法之土 15 X 野蠻之血	圖樣：光潔精華劑, sold in: - Warspear (加姆‧林行) - Stormshield (莉菈‧月絲) - Vendor in Garrison Tannery building Cost: 5 德拉諾製皮奧秘
強力光潔精華劑	175 X 光潔皮革 30 X 術法之水 30 X 魔化之疫	圖樣：強力光潔精華劑, sold by the Leather Trader visitor in your garrison - 『狐狸』傑克 (A) or 基祖 (H). Note that you have a 1/5 chance of having a tradeskill vendor in your garrison every day, and there is a set rotation of tradeskill visitors from day to day (between herb, fur, leather, ore and dust). The easiest way to find this vendor is to use the Group Finder under Custom Premade Groups on the day that the Leather Trader is active. Cost: 60 生獸皮
野蠻光潔精華劑	350 X 光潔皮革 60 X 術法之水 60 X 魔化之疫	圖樣：野蠻光潔精華劑, sold by the Leather Trader visitor in your garrison - 『狐狸』傑克 (A) or 基祖 (H). Note that you have a 1/5 chance of having a tradeskill vendor in your garrison every day, and there is a set rotation of tradeskill visitors from day to day (between herb, fur, leather, ore and dust). The easiest way to find this vendor is to use the Group Finder under Custom Premade Groups on the day that the Leather Trader is active. Cost: 60 生獸皮

This brings the total cost of upgrading a piece of mail/leather armor (from Stage 1 to 6, not including the materials to make the base item) to:
735 X 光潔皮革
45 X 術法之土
90 X 術法之水
45 X 野蠻之血
90 X 魔化之疫

The mail armor crafted by Leatherworking in Warlords of Draenor includes:
Helm: 行路頭盔
Shoulders: 行路肩衛
Chest: 行路外套
Bracers: 行路護腕
Gloves: 行路手套
Belt: 行路腰帶
Legs: 行路護腿
Boots: 行路長靴

The leather armor crafted by Leatherworking in Warlords of Draenor includes:
Helm: 柔軟頭盔
Shoulders: 柔軟肩衛
Chest: 柔軟外衣
Bracers: 柔軟護腕
Gloves: 柔軟手套
Belt: 柔軟護腰
Legs: 柔軟護腿
Boots: 柔軟長靴

The cloaks crafted by Leatherworking in Warlords of Draenor are:
Intellect: 明亮光潔披風
Strength: 強力光潔披風
Agility: 靈機光潔披風

Note that Tailors can also craft cloaks - 明亮咒織披風, 靈機咒織披風 and 強力咒織披風. They are identical in possible combinations and amount of stats to Leatherworking cloaks - the only difference is appearance.

Below are the base and upgraded versions of the armor. This item maintains whatever stats were on the base item when upgraded - the amount of those stats will increase though.

Base Armor

Stage 2 (iLevel 655)

Stage 3 (iLevel 670)

Stage 4 (iLevel 685)

Stage 5 (iLevel 700)

Stage 6 (iLevel 715)

行路頭盔	行路頭盔	行路頭盔	行路頭盔	行路頭盔	行路頭盔
行路肩衛	行路肩衛	行路肩衛	行路肩衛	行路肩衛	行路肩衛
行路外套	行路外套	行路外套	行路外套	行路外套	行路外套
行路護腕	行路護腕	行路護腕	行路護腕	行路護腕	行路護腕
行路手套	行路手套	行路手套	行路手套	行路手套	行路手套
行路腰帶	行路腰帶	行路腰帶	行路腰帶	行路腰帶	行路腰帶
行路護腿	行路護腿	行路護腿	行路護腿	行路護腿	行路護腿
行路長靴	行路長靴	行路長靴	行路長靴	行路長靴	行路長靴
柔軟頭盔	柔軟頭盔	柔軟頭盔	柔軟頭盔	柔軟頭盔	柔軟頭盔
柔軟肩衛	柔軟肩衛	柔軟肩衛	柔軟肩衛	柔軟肩衛	柔軟肩衛
柔軟外衣	柔軟外衣	柔軟外衣	柔軟外衣	柔軟外衣	柔軟外衣
柔軟護腕	柔軟護腕	柔軟護腕	柔軟護腕	柔軟護腕	柔軟護腕
柔軟手套	柔軟手套	柔軟手套	柔軟手套	柔軟手套	柔軟手套
柔軟護腰	柔軟護腰	柔軟護腰	柔軟護腰	柔軟護腰	柔軟護腰
柔軟護腿	柔軟護腿	柔軟護腿	柔軟護腿	柔軟護腿	柔軟護腿
柔軟長靴	柔軟長靴	柔軟長靴	柔軟長靴	柔軟長靴	柔軟長靴
明亮光潔披風	明亮光潔披風	明亮光潔披風	明亮光潔披風	明亮光潔披風	明亮光潔披風
強力光潔披風	強力光潔披風	強力光潔披風	強力光潔披風	強力光潔披風	強力光潔披風
靈機光潔披風	靈機光潔披風	靈機光潔披風	靈機光潔披風	靈機光潔披風	靈機光潔披風

A chart of the possible random secondary enchants for this item follows below, with the two stat combinations for each enchant (for example, the mail helm would be named "Wayfaring Helm of the Random Enchantment", where the Random Enchantment is one of the below names):

STAT	Critical Strike	Haste	Mastery	Versatility	Multistrike
Critical Strike	X	Fireflash	Peerless	Quickblade	Savage
Haste	Fireflash	X	Feverflare	Aurora	Deft
Mastery	Peerless	Feverflare	X	Harmonious	Merciless
Versatility	Quickblade	Aurora	Harmonious	X	Strategist
Multistrike	Savage	Deft	Merciless	Strategist	X

Notes about the armor:

They are BoE and can be sold on the Auction House or traded
They can be used by anyone (not just leatherworkers)
All armor can be crafted by non-Leatherworkers if you have a 製皮廠等級3 in your garrison (Except for cloaks, which only require a 製皮廠等級2)
They can be equipped at Level 91
The base armor requires the following mats to craft:

Helm: 100 光潔皮革 + 5 真鐵礦石
Shoulders: 100 光潔皮革 + 10 真鐵礦石
Chest: 100 光潔皮革 + 10 生獸皮
Bracers: 100 光潔皮革 + 1 生獸皮
Gloves: 100 光潔皮革 + 2 奢華毛皮
Belt: 100 光潔皮革 + 3 奢華毛皮
Legs: 100 光潔皮革 + 4 奢華毛皮
Legs: 100 光潔皮革 + 2 奢華毛皮

The base armor will be crafted with a random amount each of two secondary stats (chosen out of Critical Strike, Haste, Mastery, Versatility or Multistrike)
The secondary stats can be re-rolled (randomly reselected) using the consumable item 皮革翻新工具組 (1 item required per re-roll)
The quantity of secondary stats when crafted is random as well (e.g. one helm may have +116 crit and +126 haste, while another of the same type may have +96 crit and +138 haste)
This item counts towards 1 of the 3 maximum Warlords of Draenor crafted items that you can have equipped at one time
As the armor is upgraded, the appearance changes, with the gems and decorations becoming more elaborate and/or changing colour:

MAIL ARMOR

Stage 1 items have green gems inlaid
Stage 2 items have blue gems inlaid
Stage 3-6 items have red gems inlaid

LEATHER ARMOR

Stage 1 items have green gems inlaid
Stage 2 items have red gems inlaid
Stage 3-6 items have blue gems inlaid

評論來自 TerribleAtGames

This grey/trash recipe can still be bought from your respective Leather Trader, but attempting to learn it returns the error "This spell is not available to you".
So you can't use it to anything than storing it as a memory from when WoD was current content if you find it having such sentimental value.