which liquids are called heavy liquid and they must be easily available in chemical market?

Question

which liquids are called heavy liquid? And they must be easily available in chemical market

Answer 1

The ones that I use in testing precious stones are :-
1) Bromoform - Density of 2.90 and can be diluted with toluol.
2) Acetylene tetrabromide - D. = 2.95 can be diluted with toluol.
3) Sonstadt's solution. Saturated solution of potassium mercuric iodide in water D. = 3.18 can be diluted with water.
4)Klein's solution. Saturated solution of cadmium boro-tungstate in water D. = 3.28 can be diluted with water.
5) Methylene iodide (CH2I2) D = 3.32 can be diluted with toluol
6) Rohrbach's solution Saturated Barium mercuric iodide in water D.= 3.58
7)Methylene iodide with dissolved iodine and iodoform D = 3.6
8) Clerici's solution Saturated solution of thallium manolate and thallium formate in water D = 4.15 can be diluted with water.

All of these liquids are POISON and most give off noxious fumes so they must be handled with great care.
They are also, I regret to say very expensive.

Answer 2

Apparently sodium polytungstate's a pretty good heavy liquid (was just looking up it's chemistry earlier: http://www.geoliquids.com/geo_pdfs/msds_sp.pdf) - and it's the one I'm probably going to be using later on in the week (or when I get round to it...) to separate out some heavy minerals from the lighter quartz and stuff. Very expensive though, so I hear... but reusable, at least!

Answer 3

Inmyopinion, I say it water.