We present a fast method to monitor hydrogen sulfide (H2S) in ambient air based on a visible color change. Therefore. an immobilized copper(II) complex of the azo dye 1-(2-pyridylazo)-2-naphtol (H-PAN) was synthesized and prepared in a matrix for screen printing. Different materials. https://www.spidertattooz.com/Civil-Air-Patrol-Patch-National-Emergency-Services-Academy/