tholins was produced according to the procedure described earlier. Pre-mixed.. gas mixture was introduced into a custom made reaction vesse; equipped with three sets of tungsten electrodes, each with a 0.4in. arc gap. The gas mixture was exposed to electrical discharge from a tesla coil. The flow rate is set such that the presure of the chamber is maintained slightly above ambient. The apparatus was operated at room temperature continuously for three weeks and accumulated a flim of brown material(tholin)on the walls. Several hundres milligrams of tholin were scraped off the walls of the reaction vessel under atmospheric conditions, placed in glass vials and stored in vacuum dessicator for use in experiments.