TE box Rockwool contains information about the Thermal Expansion mod.

Rockwool is a non-flammable wool made from cooking Slag in a furnace. Due to a bug in Thermal Expansion that comes with Technic 7.2.6, rock wool is only available in yellow and does not work with dye. You need to manually update to Thermal Expansion or newer for the dye to work.

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Coal (Item)

Yellow Rockwool


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