Abstract: Method and apparatus for the evaporation of a solution into the ambient air. The apparatus contains a reservoir having at least one elastic wall; a first compartment outside the reservoir having an opening to the ambient air; a passage which may be intermittently opened and closed, connecting the reservoir to the first compartment; and, an absorbent material placed on a support which is outside both the reservoir and the first compartment, and which is in contact with the first compartment. By exerting pressure on the elastic wall of the reservoir, solution may be transferred from the reservoir to the first compartment through the passage when it is open. The passage is kept closed during the time intervals between intermittent transfers of the solution. The portion of solution which has been transferred to the first compartment is gradually and continuously transferred to the absorbent material for evaporation to the ambient air.

Abstract: Disclosed is a bath and process for obtaining deposits of gold or gold alloys of improved uniformity of deposit thickness on an irregularly shaped conductive surface. The aqueous plating bath contains gold as the aurocyanide complex, a mild reducing agent, a complexing agent, arsenic as a water-soluble arsenic compound, and a substituted polyamine.

Abstract: Disclosed is an improved gold-sulfite bath for plating gold and gold alloy deposits. By the inclusion in the bath of small amounts of certain organic phosphorus compounds, the quality of the deposit is rendered less sensitive to substantial changes in operating variables.