The present invention relates to the use of an emulsion for protecting the skin against aggressive chemical agents, wherein this emulsion comprises at least one amphoteric chelating agent which comprises a complex based on aluminium and on ethylenediaminetetraacetic acid or the trisodium salt thereof, having the general formula [Al (Y) Bn] C&rsquo；Dc with B being OH-,BO2 or H-, Y being a tetracarboxylate which can be protonated four times to form ethylenediaminetetraacetic acid, n being an integer equal to 0, 1, 2 or 3, D being a counterion, preferably Na+, c being an integer equal to 0, 1, 2 or 3 and c&rsquo； being a relative number having the same absolute value as c.
