Flux is a powder material used for metallurgy, limewater, and mortar. Flux can be obtained by combining a hammer and a rock of chalk, dolomite, marble, or limestone, in the crafting grid.


Flux is necessary to weld metals as well as for processing iron ore.


Limewater is created by combining a bucket of water and flux. This limewater can then be used in the process of tanning leather.


Mortar is required to combine bricks into brick blocks. It is made by combining flux, sand, and a bucket of water.