bids are invited for procurement of non-destructive testing chemicals of qa department scope of supply ( sos ) and technical specifications magnaflux® spotcheck visible penetrant ( skl-sp1 ) product data sheet sp / sp1 / 1 dated 03.12.2004 penetrant removal for large parts and comprehensive visible penetrant inspection, the hydrophilic remover system employing zr 10b is recommended. first, remove loose excess penetrant with a coarse water spray. this removes most of the surface penetrant and makes it easier for the zr-10b to function. it also keeps the zr 10b solution from becoming contaminated with penetrant rapidly. second, immerse the prerinsed object into a 20% solution of zr -10b in water 1 part 4 parts water ) . agitate gently for 30 seconds to one minute, remove and rinse with clear water. the wet object must be dried before applying solvent developer: with an aqueous developer. drying is to be don