TLC Reagent Sprayers deliver a uniform spray mist of visualization reagents for TLC and Paper Chromatography. Spray pattern is adjusted by varying the position of the thumb on the vent hole. TLC reagents or corrosive liquids touch only the nonreactive borosilicate glass atomizing sprayer head and flask. Sprayers feature a head-to-flask connection that consists of a screw-thread ground joint, a connecting cap, and a loosening ring. If reagent crystallization or residue formation causes the joint to freeze, unscrew the cap back onto the ring and the joint will easily come apart. Sprayers operate on as little as 1psi (0.07 kg/cm2), although optimum results are obtained at 3 to 5psi (0.21 to 0.35 kg/cm2). Remove connecting cap, loosening ring and O-ring before autoclaving.