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Magnaflux ZL-67 Level 3 Water Washable Fluorescent Penetrant. A high-sensitivity Level 3 penetrant, ZL-67 fluorescent water removable penetrant is designed to find smaller, finer indications in safety-critical components common to aerospace and engineering applications. The ZYGLO®fluorescent penetrant process is a nondestructive testing (NDT) method that helps you locate and identify surface defects in order to screen out potential failure-producing defects, correct Zyglo® ZL-67 penetrant meets OSHA requirements for Class III B liquids due to its high flash point and can be used in open dip tanks. Zyglo® ZL-56 (Level 4) Water Washable Fluorescent Penetrant Zyglo® ZL-56 fluoresces a bright greenish-yellow under ultraviolet radiation and is safe for use on most engineering and aerospace alloys including aluminum, steel, nickel and titanium.