Dyed leather armor becomes black in /replaceitem and /give command

I was halfway in making a minigame, and I tested the new /replaceitem command and typed this (/replaceitem entity @p slot.armor.chest leather_chestplate 1 0 {display:{color:3491355}}) to immediately place a green leather tunic onto the player, but when I press a button linked to the command block, the armor was dyed black! I tried other things instead of the 3491355, such as green and 13 (wool ID for green), and it still doesn't work! The bug also appears with the /give command (/give @p leather_chestplate 1 0 {display:{color:3491355}}).