Is this the same as the so-called GAD gold and silver foil capacitors made by Mundorf, a pair of which is in the Musetec MH-DA005 DAC?
The designer of the DAC writes, "In the analog circuit, there are two particularly important capacitors. We compared a variety of expensive capacitors, such as copper foil, silver foil, gold and silver foil, oil immersion capacitor, and finally selected the GAD gold and silver foil capacitor."