That’s not the only use of the technique though, and perhaps one of the simplest is to use a 3D-printed mould for casting concrete. It’s what [ArtByAdrock] is doing in their latest video ...

While it’s not a danger in and of itself, efflorescence can be linked to excess moisture, mold growth, or poor drainage.

There are a variety of cleaning products available ... Diluted liquid chlorine bleach removes mold from concrete, brick, stucco and other outdoor materials, but the run-off may damage plants ...