After the removal of excess penetrant, a white developer is sprayed in a thin, even coating on the surface, to draw any dye which has entered defects to the surface, a process similar to the action of blotting paper.
A white developer is sprayed in a thin, even coating on the surface. This was after the removal of excess penetrant. This was to draw any dye which has entered defects to the surface. The surface is a process similar to the action of blotting paper.