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Solid bromine (due to the high pressure) can be found floating in suspension in ocean water over three miles deep in areas where the aquaeous concentration of bromine is high enough - this is harvested by humans when the currents move it closer to the shore. Clams also use bromine to help make their shells, as with calcium carbonate. The Greeks extracted bromine by a process known as 'clamscrubbification' (in much the same way as dye was extracted from molluscs on the island of Lesbos), as they lacked the modern methods of harvesting it from the ocean water itself.  

Solid bromine (due to the high pressure) can be found floating in suspension in ocean water over three miles deep in areas where the aquaeous concentration of bromine is high enough - this is harvested by humans when the currents move it closer to the shore. Clams also use bromine to help make their shells, as with calcium carbonate. The Greeks extracted bromine by a process known as 'clamscrubbification' (in much the same way as dye was extracted from molluscs on the island of Lesbos), as they lacked the modern methods of harvesting it from the ocean water itself.  

Bromine is a bleach. It is poisonous in fluid form and bromine vapor is destructive of human skin, eyes and respiratory tract. It causes serious burns. A concentration of 1 ppm can cause eye watering and when inhalation of concentrations below 10 ppm occurs, one starts to cough and the respiratory tracts are irritated.<ref>[http://minerals.usgs.gov/minerals/pubs/commodity/bromine/130300.pdf U.S. Geological Survey, Mineral Commodity Summaries]</ref><ref>[http://www.the-innovation-group.com/ChemProfiles/Bromine.htm Bromine Chemical Profile]</ref><ref>[http://www.encyclopediaofarkansas.net/encyclopedia/entry-detail.aspx?entryID=4514 State of Arkansas Encyclopedia: Bromine]</ref><ref>[http://www.geology.ar.gov/minerals/industrial_miner_a_d.htm#bromine State of Arkansas: Bromine]</ref>

Bromine is a bleach. It is poisonous in fluid form and bromine vapor is destructive of human skin, eyes and respiratory tract. It causes serious burns. A concentration of 1 ppm can cause eye watering and when inhalation of concentrations below 10 ppm occurs, one starts to cough and the respiratory tracts are irritated.<ref>[http://minerals.usgs.gov/minerals/pubs/commodity/bromine/130300.pdf U.S. Geological Survey, Mineral Commodity Summaries]</ref><ref>[http://www.the-innovation-group.com/ChemProfiles/Bromine.htm Bromine Chemical Profile]</ref><ref>[http://www.encyclopediaofarkansas.net/encyclopedia/entry-detail.aspx?entryID=4514 State of Arkansas Encyclopedia: Bromine]</ref><ref>[http://www.geology.ar.gov/minerals/industrial_miner_a_d.htm#bromine State of Arkansas: Bromine]</ref>