When repairing Leather Armor that has been dyed it will always produce a different Leather Armor piece. This piece of armor will have the correct amount of damage, but will always be uncolored. This will even happen when using armor with precisely the same color or between a dyed and an uncolored piece. This can be a problem when using nonrenewable colors such as blue (Lapis Lazuli). The Anvil will preserve the enchantment and name as usual, but it will come out uncolored.