Where did the gold go?

[Kasse]

We had 2 grams of gold. It sat I water for a week and turned black. I put the gold into a melting dish with borax and melted into a bead about 12mm in size. Put the bead into a cuppel with 3 grams lead into the furnace at 1700. Came back in 40 minutes. And there was nothing in the cuppel. Not gold no red lead oxide. The dish if the cuppel was black with no metallics. Split the cuppel and there is a dark gray sparkling layer about 2mm thick, but no gold present. Where did the gold go? Need some help.

 

[haveagojoe]

Gold will evaporate at around 1400C.

 

[Yggdrasil]

We had 2 grams of gold. It sat I water for a week and turned black. I put the gold into a melting dish with borax and melted into a bead about 12mm in size. Put the bead into a cuppel with 3 grams lead into the furnace at 1700. Came back in 40 minutes. And there was nothing in the cuppel. Not gold no red lead oxide. The dish if the cuppel was black with no metallics. Split the cuppel and there is a dark gray sparkling layer about 2mm thick, but no gold present. Where did the gold go? Need some help.

There is not enough information.

Anyway the "Gold" turning black should have been a wake up call.
Gold do not react to any single acid and definitely not Water.
How do you know it was Gold in there in the first place?

How was this Gold achieved.
As detailed as possible please.
Start material, how it was treated and the whole story.

 

[Yggdrasil]

Gold will evaporate at around 1400C.

I suspect he is talking about Farenheit.
And Gold has a boiling point at 2836 Centigrade

 

[haveagojoe]

I suspect he is talking about Farenheit.
And Gold has a boiling point at 2836 Centigrade

i stand corrected

 

[Alondro]

As Yggdrasil said, actual gold will not turn black in water. What I HAVE seen turn black in water (especially if it's hard water that's alkaline) is some aluminum brass alloys.

 

[anachronism]

In fairness, gold going black in water would have set off a few alarm bells.