Abstract: Disclosed is an electroplating solution for the deposition of silver; said solution containing silver in the form of a complex of silver with hydantoin or a substituted hydantoin compound; said solution also containing an excess of the hydantoin or substituted hydantoin compound employed, together with an effective quantity of a nonprecipitating electrolyte salt, and also an effective quantity of 2,2? dipyridyl for the purpose of obtaining a mirror-bright to brilliant deposit.

Abstract: Disclosed is an electroplating solution for obtaining bright white rhodium electrodeposits, said solution containing rhodium in the form of a soluble sulfate or phosphate compound, together with an excess quantity of sulfuric acid, phosphoric acid, or mixtures of the two; the improvement of which is the addition of one or more nitrogen-containing heterocyclic organic compounds, in which at least one nitrogen is incorporated into a six-membered aromatic ring.

Abstract: Disclosed is an electroplating solution for the deposition of silver; said solution containing silver in the form of a complex of silver with hydantoin or a substituted hydantoin compound; said solution also containing an excess of the hydantoin or substituted hydantoin compound employed, together with an effective quantity of a nonprecipitating electrolyte salt, and also an effective quantity of 2,2? dipyridyl for the purpose of obtaining a mirror-bright to brilliant deposit.