The Blue Concrete is a hazy blue building-block.
It can be crafted in your Crafting Menu (default key "q") after the according crafting recipe has been unlocked by
- crafting or obtaining an Obsidian Mining Cell from Obsidian (bars), Stone Slabs, Bedrock, Magnetite and Mushrooms
- creating Blue Pigment by putting Blue Flowers from Elderwood trees into a Processor, or by finding this pigment in Obsidian Treasure Chests or obtaining it from any kind of Keepa
- mining Siltstones from the Stalactite layer, which requires an Obsidian Mining Cell or stronger Mining Cell to be equipped
To craft 8 (blocks of) Blue Concrete at a time, you'll need (as of R44 in June 2017):
- 1 Blue Pigment made of Blue Flowers from Elderwood trees in a Processor or found in Treasure Chests
- 1x Melted Wax made of Beeswax in a Forge or looted from Wood Treasure Chests or Stone Treasure Chests
- 4 (blocks of) Siltstone taken from the Stalactite layer with an Obsidian Mining Cell or better
- 2 Globs of Goo (made from Mold in a Processor or looted/harvested from many creatures
The block can be rotated by pressing and holding R and moving the mouse while holding the left mouse button.