| http://www.w3.org/ns/prov#value | - Examples of optional ingredients are non-aqueous solvents such as C1 -C4 alkanols and polyhydric alcohols, pH buffering agents such as strong or weak acids e.g. HCl, H2 SO4, phosphoric, benzoic or citric acids, rewetting agents, electrolytes, for example calcium chloride, anti-gelling agents, perfumes, perfume carriers, fluorescers, colourants, hydrotropes, anti-foaming agents, anti-redeposition a
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