Question about Horadric cube formula

[:1]Im woundering if the Lem+Ko+Perf diamond formula on Ladder is only to upgrade uniq items or if it can be used to upgrade white items aswell, as im failing to upg. a superior ghost armor with 15 ED into a dusk shroud.
Am i doing something wrong or is the formula simply not useable on other then uniq items?

Thank you in advance for inputs.|||You're correct about uniques only. There are no upgrade formulas for white or grey items.|||

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Q u o t e:
Im woundering if the Lem+Ko+Perf diamond formula on Ladder is only to upgrade uniq items or if it can be used to upgrade white items aswell, as im failing to upg. a superior ghost armor with 15 ED into a dusk shroud.
Am i doing something wrong or is the formula simply not useable on other then uniq items?

Thank you in advance for inputs.

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Q u o t e:
Originally posted by The Arreat Summit
1 Ko Rune + 1 Lem Rune + 1 Perfect Diamond + Exceptional Unique Armor = Elite Version of Armor (Single Player, Ladder Only)
This formula changes the base item type from the exceptional to elite version. For example Ghost Armor is turned into a Dusk Shroud. This does NOT convert the item to the Elite Unique version of the Unique Item. Unique item bonuses remain the same; only the item it's based on is upgraded. This can be used to upgrade Ethereal Items also. They will continue to be Ethereal after they are upgraded. Also if the item is socketed, then jewels or runes and their mods will also remain. Armor refers to any sort of armor, including helms, boots, belts, gloves and shields, not just body armor.

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~Hazzar