| http://www.w3.org/ns/prov#value | - Thus, another object of the present invention is a method according to the preamble of claim 10, characterized in that it comprises synthesizing the said amphoteric surfactant in the presence of a quantity of urea suitable to provide a concentration from 0.01% to 5% by weight, preferably from 0.1% to 3% by weight preferably from 0.1% to 0.5% by weight, of the total weight of the solution.
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