ABSTRACT
The purpose of the study is to establish hygienic properties of the new preparations for intensive washing and their effect on the skin of man. Examinations are performed on 5 new washing preparations from firm "Verila": "Linda" (from the producer and from the trade network from the country--Ruse, Blagoevgrad, Stara Zagora, Pleven, Cherven Bryag, Plovdiv and Dobrich), recipe No 1, 2, 3 and 4. Sanitary and chemical examinations are carried out: organoleptic indices, nonionogenic surface active substances, total content of surface active substances, content of carbamide, sodium carbonate, ammonium nitrate, formaldehyde and free alkali. Investigations are made on 125 volunteers for skin irritative and allergenic effect, with epicutaneous test before and after 30-day washing--respectively with 0.5% and 2% and with 5% and 20% of the washing preparations. The results point out the absence of ammonium nitrate and formaldehyde and compliance with the content of the composition of the declared expenditure norms (except of "Linda" from the trade network of the country). There are no reactions of skin irritation and allergy in neither of the subjects with all washing preparations. Recommendations are given to the producer for observing the technological discipline and requirements to the packings.
