BS EN ISO 12706:2001 pdf download – Non-destructive testing – Terminology – Terms used in penetrant testing. 2.7 dip rinse Means of removing excess penetrant in which the test parts are dipped into a tank of water which may be agitated. 2.8 dry developer Developer in the form of a fine dry powder used mainly with fluorescent penetrants. 2.9 dual purpose penetrant Penetrant that gives indications which are capable of being viewed either under visible light or UV-A-radiation. 2.10 electrostatic spraying Application of eletrically charged particles to an earthed test surface. 2.11 emulsification of penetrant Action of emulsifiers on post...