The invention relates to the use of 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, for preventing contact allergies. It also relates to a device, a part of which comprises said amphoteric chelating agent.
