What is real name for those "" gold"" alloys ???

[MR Senior L4S]

What is real name for those "" gold"" alloys

From 2009 -Illinois . Checked and tested , contains 40-60% of AU + Cu , one of them have 20% AG and 40/40 AU +Cu , one is covered by black cristals , they not dissapear after 24hr. in sulfur acid . Posted some pcs. in Illinois forum -

 

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[chipveres]

Re: What is real name for those "" gold"" alloys

The Spanish use the word "tumbaga" for arbitrary mixtures of gold, silver and copper. Unfortunately, its English cognate is "tombac", but that means a brass alloy that resembles gold in appearance only. So I'm not sure what to call your fine specimens in English.

Chip V.

 

[BioProfessor]

Re: What is real name for those "" gold"" alloys

Tombac a brass alloy that looks resembles gold in appearance only??

I'm confused.

Daryl

 

[DanB]

Re: What is real name for those "" gold"" alloys

looks like copper slag that contains gold......soak in nitric acid to eliminate the copper content.....acid eats copper leaving the gold unharmed...

db

 

[hammered]

Re: What is real name for those "" gold"" alloys

Hi guys,
I think the name of the alloy you are looking for is Electrum. A naturally occurring alloy of gold, silver and copper. The Greeks used it for their coins.

hammered

 

[chipveres]

Re: What is real name for those "" gold"" alloys

According to Wikipedia, tombac is a high-copper brass alloy. Here is more than you ever wanted to know about it:

http://en.wikipedia.org/wiki/Tombac

Please note that the present specimens are *not* tombac. They have too much gold for that.

Chip V.

 

[Aufinder01]

Re: What is real name for those "" gold"" alloys

Dore... A mix of metals. (Dooray)

Aufinder01

 

[mrs.oroblanco]

Re: What is real name for those "" gold"" alloys

Looks alot like our gold "amalgam".


B

 

[Eu_citzen]

Re: What is real name for those "" gold"" alloys

Hi guys,
I think the name of the alloy you are looking for is Electrum. A naturally occurring alloy of gold, silver and copper. The Greeks used it for their coins.

hammered

Electrum is only for gold and silver.

Auricupride is the word for the natural mineral, gold and copper.