N4 Gold Cleaning Solution

N4 solution can be used safely in cleaning Au/Cu or Au/Ag alloyed coins, coins and metals in the settings of 8 Carat – 333 mg 14 Carat – 585 mg 18 Carat – 750 mg 21 Carat – 875 mg 22 Carat – 916 mg 24 Carat – 1000 mg. Application can be done with periodic checks between 0.25 – 6 hours.