METHOD OF DETERMINING DETERGENT POWER OF HARD SOAP Russian patent published in 2012 - IPC G01N33/00 

FIELD: chemistry.

SUBSTANCE: method involves washing the artificially soiled surface of an object, measuring the degree of washing off the dirt evaluating the washing results, where the object for soiling used is the outer surface of a hand and the dirt used is a mixture containing two components: white petrolatum and iron oxide or laser printer toner based on styrene acrylate polymers; the artificial dirt on the outer surface of the hand is washed off using a dish containing a solution of the analysed hard soap in an amount which completely covers the outer surface of the hand rolled into a fist, and washing is carried out by pulling on said surface a moist fine-pored sponge on which a load of two kilograms is first placed; measurement of the degree of washing off the dirt on the outer surface of the hand is carried out by photographing the hand before and after washing with solutions of hard soap and then processing the photographs on a computer; washing results are evaluated after each washing based on the content of grey colour on the obtained photographs.

EFFECT: high accuracy of results, simple technique of determination, obtaining characteristics for establishing conformity of a test agent with its main purpose.

7 ex, 9 tbl, 48 dwg