Since all forms of potassium alum are soluble in water, when the stone is wet or applied to wet skin, an invisible, fine layer of the mineral is rubbed off the stone and applied to the skins surface.

因为各种状态的钾明矾都能溶于水，当把它弄湿或接触湿皮肤时，会有一层肉眼看不见的细腻矿物层从钾明矾表面脱落，吸附到皮肤表面。

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Water soluble potassium ions in potassium hexatitanate whiskers (PTW) of calcination synthesis were investigated in this paper.

研究了烧结法制备的六钛酸钾晶须（PTW） 中的水溶钾。

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Result: Ming Radix Codonopsis contains fat-soluble vitamin e, K and water-soluble vitamin c, B1, B2 and the herbal decoction and paste contains higher potassium and calcium ion.

结果：明党参根中含有脂溶性维生素e、K和水溶性维生素c、B1、B2；水煎膏中含有较高的钾、钙离子。

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They hired a scientist to come up with a formulation of chemicals that delivered nitrogen, potassium and phosphorus in highly water-soluble form, so that an impatient gardener could give plants an instant shot to the leaves, so to speak.

FORBES: Magazine Article