Special for NDT trials. Inspection of welds, castings, forges. Eliminates with water and solvents. Very fast special drying formula, reveals defects on the surface. WS 1821 S Crack 2 is a white developer spray, developed exclusively for NDT, complying with ASTM E-165 specifications. It locates discontinuities, pores, fissures, by means of a simple 3-step process, WS 1820 S Crack 1 and WS 3050 S Crack 3 are used together with WS Crack 2. Characteristics of White Developer Spray: Can be removed with water and solvents. It works with natural light. Excellent developer characteristics. Ultra fast drying time. Very good spraying on surfaces. It cleans quickly, saving time and water. Meets ASME Section V specifications for sulfur, chlorinated and halogenated solvents.