| http://www.w3.org/ns/prov#value | - The said agent can be an acid, for example an inorganic acid such as HCl, HNO3 or H3 PO4 or a saturated or unsaturated mono- or polycarboxylic acid such as acetic acid, formic acid, oxalic acid or citric acid, when the value of the pH of the emulsion has to be lowered, or else a base or a basic salt, especially an inorganic base consisting of an alkali metal hydroxide such as sodium hydroxide or o
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