At the time, salt water had not been used in a flotation mill and it had not been shown that organic compounds could be effective floating agents.
2.
:Surface tension ( mentioned above ) is an impressive " floating agent . " I tried the experiment of putting tapwater ( density about 1 gm / cm 2 in a dish, and then placed placed a very large steel sewing needle ( density about 8 gm / cm 2 on the surface, where it floated nicely . talk ) 19 : 03, 26 September 2011 ( UTC)
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