White developer aerosol developed for NDT, meeting ASTM E-165 specifications. It locates discontinuities, pores, and cracks using a simple three-step process. It is used in conjunction with WS 1820 S Crack 1 and WS 3050 S Crack 3. 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.