Minecraft - Pocket Edition Cheats[ IPHONE ]
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Glitch - Wood in Furnace glitch
What you have to do is get any amount of BIRCH WOOD(white), any amount of OAK WOOD(brown, but not as dark as spruce wood), and a furnace.
Then, put all the BIRCH WOOD in the bottom of the furnace, and the OAK WOOD will be BIRCH WOOD.