This next image illustrates that 1 mL of gold chloride is being pipetted onto the surface of the mixed fluxes.

A gold (Au) Inquart is placed upon the fluxes via a graduated polypropylene pipette. Notice that there is a reaction between the dilute HCl and the fluxes.
Notice the yellowish coloration of the gold chloride in the pipette.
The Au Inquart = 1 mL which is equivalent of 1 mg of Au.
The gold chloride addition was lightly mixed with the fluxes to avoid acid volatility which might carry away some of the gold.
A silver bead of a known size was inserted into the fluxes to act as a collector for the gold and parting in acid.

The completed, but still hot Au melt

The cold Au melt, showing a clear slag allowing the Lead Button to be easily seen.
Notice how the melted fluxes came near the top of crucible.

The crucible containing the cold Au melt is broken to reveal the slag and Lead button (at bottom right)

The mostly clean Lead button from the Au melt, which weighs 30 grams.
This button was cupelled in a bone ash cupel at about 1800 degrees F for approximately 45 minutes to render the golden colored silver prill that is in cupel.
There were no unusual effects of the cupellation, however the surface structure of this silver & gold bead/prill is definitely not that of normal silver.

30x – The cupelled bead/prill, which originated  from the 1 mL of AuCl and an inquarted 0.062” silver bead.
Size of retrieved golden colored bead = 0.055” apparently some silver was lost.

20x – The prill is subjected to 2 drops of H2O and 1 drop HNO3 with some heat on a glass slide.
Notice the blacks forming on this Ag Au bead as the acid attacks the bead’s surface.
If the prospector did not know what was in this assay there’s no telling where the mind might want to travel, which is why assays like this ought to be conducted.

30x – after about 30 minutes into the acid attack there are still lots of blacks (Au) being liberated from the silver prill.

After about 1 hour of being subjected to the nitric acid attack.
No visible yellow gold showing at all. However, there is a definite yellowish solution, which I presume to be colloidal gold.
Higher magnification does not yield any specific crystallization of this black debris that is probably gold oxide.

Special note: In the subsequent fusions notice the similarity of the blacks, which should be a caution flag as to what is called gold or one of the pgms.