mittepurustava kontrolli meetod materjali (toote) pinnale avanevate hälvingute avastamiseks, mis põhineb penetrandi (imbvärvi) märgamisvõimel ja tungimisel pinnale avanevatesse materjali ebapidevustesse (vt imbkatse/vedelikimbkatse), method of non-destrucive testing (NDT) in which a penetrating dye is introduced to potential surface discontuinities, then developing agent is added that will show the flaws (see: liquid penetrant inspection/liquid penetrant examination)