Dear adepts ot the Great Work,
I remember my first meeting with Jacques Dufour, in front of the Beaubourg Center, near his lab at CNAM university.
He is a specialist in nickel-based catalysts, which he studied during his long career at ROYAL DUTCH SHELL. If I had obtained his results, I would have thought that the product obtained was a nickel oxide and that its color was due to light interference in the thin layers, but he knows his job perfectly and can be trusted.
Rereading the great Fulcanelli, it occurs to me that if the pseudo-silver possesses the chemical qualities of silver at a sufficiently important point, it seems to me possible to use the cupellation to separate it from the nickel powder mixture.
Here's how I suggest doing it: mixing the nickel powder with molten lead after reaction with deuterium. The pseudo-silver will dissolve, and of course a bit of nickel will dissolve too.
The undissolved nickel will float at the top of the lead.
Then, I suggest to put some grams of lead into cupellas made of calcium phosphate (available in lab suppliers) and heat the cupellas over 1100°c in air (or oxygen) during hours.
The powder of bone of the cupellas has the strange power to absorb the metallic oxydes like a sponge. This physical phenomenon is not totally understood now. (Lead oxide is liquid, and its superficial tension allow it to be absorbed by the ashbone cupella, but the other oxydes are refractory, and they are absorbed too.)
At the end, a little sphere of pseudo silver will remain in the cupella, because lead oxide, nickel oxide, and other metal oxide will be absorbed by the cupella (this technique is know since the bronze age)
If the amount of pseudo-silver is too small to obtain the "lightning" (appearance of a shiny silver ball), I suggest using the "in-quartation" alchemical method. It's about adding a small amount of silver as "entraîneur." (i don't know the name in English) (As Marie Curie did by adding barium to entrain radium)
Next, I suggest dissolving the silver and pseudo-silver mixture in a bismuth, and using a "Von Ardenne style" liquid metal anode to introduce the silver and pseudo-silver ions into a mass spectrometer. We should see the two peaks corresponding to silver and pseudo-silver.