Medtech RTX Developer is a solution of ruthenium tetroxide and organic solvent which is highly sensitive to latent fingerprints. The Developer is used to develop latent prints which are deposited on all varieties of substrates with the exception of substrates with black porous surfaces. Substrates applicable to developing with RTX are human skin, paper, thermal paper, clothes, leather, glass, plastics, both sides of adhesive tape and vinyl tape, wooden goods, metal and stone. The Developer method can be applied for developing prints either by a fuming method or a liquid method. For developing with the fuming method, the Fumer Device and Air Pump are both required. It is recommended that a fuming hood or an organic vapor respirator be used when processing with RTX.