if it doesn't have an Enchant Item listed then you can't enchant it. if it's a 70 weapon, then it's not-enchantable.
wrong and wrong lol
lvl 70's you can enchant
as for not having an enchant item giga pants dont (ep 4 ones) yet they can be enchanted, mine are  atm
the enchant item is sacra souls btw same as HD's
just put it in the enchant slot on a black smith it will tell you.