a liquid penetrant that is characterized by an intense color, usually red and produces vivid red indications in contrast to the light backround under visible light (see: penetrant test), imbkatsel kasutatav vedelik, millele on omane intensiivne värvus, taval. punane ja mis annab erksa punase indikatsiooni detaili pinnal nähtava valguse abil (vt imbkatse)