Penetrant Testing (PT / LPI): The Complete 2026 Guide — Type 1/2, Method A/B/C/D, ASME V Art 6

Definitive 5,000-word guide to liquid penetrant testing. Covers Method A water-washable, B/D post-emulsifiable, C solvent-removable, Type 1 fluorescent vs Type 2 visible, dwell time, developer forms a-e, sensitivity Level 1-4 per ASTM E1417 and ISO 3452-1.