8 points
The article claims it’s 2.5x as dense as water, which according to this density chart is probably bromine.
5 points
*
I actually bet it’s just very very fine stonedust and water in suspension.
2 points
6 points
*
Supposedly it’s exactly that, but stabilized by a polymer to keep it in suspension for up to 60 days without mixing. https://online.flippingbook.com/view/1025707592/10/#zoom=true
Edit: I’ve concluded it’s likely calcium carbonate.
1 point
