How do I dye items?
First of all, you need a bottle of dye. To use the dye, right click on the bottle and then left click on the item you want to dye.
Items in your Wardrobe can be dyed in more colours than one. Every time you use dye on an item in the Wardrobe, the new colour is added to it. You will see a small drop down menu at the bottom of the Wardrobe which lets you select the colour before equipping it.

Where can I get dye?
You can buy the basic colours at the Auction House, Lalia’s Market, Lotro Store, or make them yourself if you are a Scholar. Special colours are available at all Seasonal Festivals. Whether or not these can be bought with Festival currency or Mithril coins, switches every other year. So if a colour is only available for Mithril this year, you can buy it with Festival currency next year. These special colours are also sometimes available at the Auction House.

What colours are available?
Crafted (by Scholars):
Violet, Navy, Indigo, Dark Green, Olive, Gold, Rust, Red, Sienna, Umber, Black, White, Grey, Burgundy, Turquoise, Orange, Yellow, Sea Blue, Evendim Blue, Forest Green, Ered Luin Blue, Rivendell Green, Purple, Rose, Crimson, Ranger Green, Walnut Brown, Steel Blue.
Seasonal Festivals:
Bullroarer’s Green, Dark Purple, Lavender, Shire-plum (Spring)
Dark Clay, Rohan Green, Shire Peach, Sunset Orange, (Farmers Faire)
Ashenslades Green, Autumn Leaf, Imladris Fallen Leaf, Twilight Purple (Harvestmath)
Belegaer Blue, Dark Mossy Green, Lórien Gold, Moria Silver (Yule)

There is also Dye Wash available from Novice and Expert Tailors, which removes all colours from an item and returns it to its original default colour.

Dyeable area
Most items can only be dyed partially. This means that there is an area which will absorb the dye, and an area which remains the same. To check which area of an item is dyeable, use the Dressing Room Preview (ctrl+left click).

I cannot dye my item. Why?
Not all items can be dyed. To check if your item is dyeable, use the Dressing Room Preview (ctrl+left click). If the colour options for your item are disabled, it means the item cannot be dyed. This is commonly the case for unique items, pre-order items and the level 65 Helegrod sets.