sentences:  Their appearance is often considered attractive or appealing, and they may be sold in transparent containers, showing off, for example, the needlelike appearance of sodium sesquicarbonate crystals.The earliest systematic exposition of the different kinds of salts, their uses, and methods of extraction was published in China around 2700 BCE.Hippocrates encouraged his fellow healers to make use of salt water to heal various ailments by immersing their patients in sea water.