Daguerreotypes is an obsolete photographic process, invented in 1839, in which a picture made on a silver surface sensitized with iodine was developed by exposure to mercury vapor. Mercury vapor is a type of lamp using mercury which emits a very clear, intense bright light. Cyanotypes is a photographic printing process that produces a cyan-blue print. Engineers used the process well into the 20th century as a simple and low-cost process to produce copies of drawings, referred to as blueprints. The process uses two chemicals: ferric ammonium citrate and potassium ferricyanide. Liquid Emulsion also known as Liquid Light or Silver Gelatin, is a silver based sensitizer designed for applying on any surface, exposing with an enlarger and processing in conventional black & white chemistry. An emulsion is a two phase system of immiscible liquids in which one liquid is dispersed in the other in the form of microscopic droplets. This dispersion is achieved through ...