Chemical Agent Liquid Detector Papers differentiate between three groups of liquid chemical agents G- (nerve), V- (nerve) or H-series (blister) agents. Expose one paper to a suspected contaminated surface either by wiping the surface with the paper or by attaching the paper to a surface that may be exposed in the future. Paper turns a specific color, identifying what group a liquid chemical agent belongs to one color for each group (G, V or H). M8 Detector Paper comes in booklets of 25 sheets. Must purchase in qtys of 50.