After forming a resist film including a hygroscopic compound, pattern exposure is performed by selectively irradiating the resist film with exposing light while supplying water onto the resist film. In the process a mixture comprising a solution of a polysaccharide and a smoke-modifying agent is fed through nozzle means, and a jet of said mixture issuing from the nozzle means is brought into contact with a solution containing multivalent cations. Preferably, the elements includes a foam material such as a closed cell polyethylene foam and the substrate includes a knitted fabric. The ladder-like sensing series are separated to each other. An ink jet printing ink composition includes at least a colorant, water, an alcohol solvent, and a surfactant, wherein the alcohol solvent contains a poorly water-soluble alkane diol, a water-soluble 1,2-alkane diol, and a water-soluble symmetrical alkane diol having a hydroxy group at both ends.