Minecraft wiki entry for Removed_blocks, associated text: In the June 24, 2010 build of Infdev, 15 of the 16 different colored cloth blocks were outright removed from the game. Specifically, this referred to IDs 21-34, as well as 36. The remaining ID, 35, belonged to light gray cloth prior to this version. ID 35 was changed to instead have the white cloth texture, ultimately rendering it the actual white cloth block, and removing light gray cloth as a result, despite white cloth technically also being removed in this version due to having ID 36.