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。

youdao

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。

youdao

A wool surface is oxidized with potassium permanganate in saturated salt solutions, which is an electrolyzed compound with potassium ion in water-soluble solutions.

通过电解钾离子化合物的水溶液，得到的高锰酸钾饱和盐溶液对羊毛表面进行氧化。

youdao

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