FIELD: analyzing and investigating materials.
SUBSTANCE: method comprises processing the surface with a water-soluble penetrating agent, applying developer, recording defects, and washing the surface with water. Each of the washings is carried out in two baths arranged in series, with fresh water being supplied to the second bath in amount that is determined by the permissible concentration of contaminant and overflowing the water from the second bath to the first one in the direction opposite to the movement of the article.
EFFECT: improved method and reduced cost of control.
1 dwg
