Colors for Mythic items not working?

The color doesn't seem to work

AssassinChestplate:
Id: 299
Display: '&8White Leather Chestplate'
Attributes:
Chest:
Armor: 6
ArmorToughness: 2
Lore:
- '&7Stats:'
- '&7+Armor 6'
- '&7+Armor Toughness 2'
Options:
Color: 255, 255, 255