| http://www.w3.org/ns/prov#value | - It is, therefore, required that these ions be removed either by deionization of the water or by precipitation of the contaminating ions, e.g. with silver ions added in the form of a soluble silver salt.Although silver ions thus appear to provide a universal solution to the above-discussed problem of low etch rates as well as that caused by the presence of free chloride and bromide ion content, the
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