britannia gold coin question.

[darrol]

Is the  Britannia gold coin up to  - 1989    the same alloy metal mix as a gold sovereign ?    I have a 1987 Britannia and it looks slightly cooper coloured a bit like the new gold sovereigns,  while 2000 and higher dates are more yellow gold . it just got me wondering as I don't know much about the Britannia  .

[5huggy]

There is an difference in the alloys - but IM NOT SURE on constitution of  - Im sure there are more knowledgeable "Professor's" in the Forum that will pop along and educate us both!

[Au79]

Britannia gold coin non gold component:

1987-1989 copper 22k

1990-2012 silver 22k

2013-Present pure gold 24k

https://en.m.wikipedia.org/wiki/Britannia_(coin)

[5huggy]

Well thats awesomely superb representation and education thanks "PROFFESSOR" @Au79

We should have a place to put factual stuff like this as "stickies" as a reference bank! @ChrisSIlver

[RoughDog]

That chart does not seem accurate.  According to the chart anything 90% gold or more is going to look very yellow and almost identical.

That's not the case with the Krugerrand and sovereign.

 

 

[Au79]

Pure gold 24k is slightly reddish in colour. Since Sovereign, Kuggerand, Eagles are still on crown gold tradition of 22k, which is 91.7% pure gold and remaining traditionally copper or mix of copper & silver with ratio preferred by the mint. Yellow gold 18k which has lower percentage of  pure gold (75%) and higher percentage mix of copper & silver.

Indeed the colour chart is a linear fix percentage for the various shades of alloyed gold. The accuracy of the above colour chart versus the various mint preferred ratio of cooper & silver for their alloyed gold will not be exact in colour. An example, both rose gold and yellow gold contain the elements of gold, copper and silver. The ratio mix will determine which karat of alloyed gold it become. The final colour tone is also different because of that. And if we add in the minute traces of other metals contamination, what will it be for the correct shades of alloyed colour variety?

Charts are often used to ease understanding of large quantities of data and the relationships between parts of the data. Charts can usually be read more quickly than the raw data. 

https://en.m.wikipedia.org/wiki/Colored_gold

https://en.m.wikipedia.org/wiki/Crown_gold

”Each of us had something to learn from the others and something to teach in return”

 

[5huggy]

25 minutes ago, Au79 said:

”Each of us had something to learn from the others and something to teach in return”

EXCELLENT! 

[RoughDog]

3 hours ago, Au79 said:

Pure gold 24k is slightly reddish in colour. Since Sovereign, Kuggerand, Eagles are still on crown gold tradition of 22k, which is 91.7% pure gold and remaining traditionally copper or mix of copper & silver with ratio preferred by the mint. Yellow gold 18k which has lower percentage of  pure gold (75%) and higher percentage mix of copper & silver.

Indeed the colour chart is a linear fix percentage for the various shades of alloyed gold. The accuracy of the above colour chart versus the various mint preferred ratio of cooper & silver for their alloyed gold will not be exact in colour. An example, both rose gold and yellow gold contain the elements of gold, copper and silver. The ratio mix will determine which karat of alloyed gold it become. The final colour tone is also different because of that. And if we add in the minute traces of other metals contamination, what will it be for the correct shades of alloyed colour variety?

Charts are often used to ease understanding of large quantities of data and the relationships between parts of the data. Charts can usually be read more quickly than the raw data. 

https://en.m.wikipedia.org/wiki/Colored_gold

https://en.m.wikipedia.org/wiki/Crown_gold

”Each of us had something to learn from the others and something to teach in return”

 

I was referring to the Krugerrand which is supposed to be 22 carat, 91.67% gold with 8.33% copper.

That puts it near the top of the triangle which appears a lot more yellow on my monitor than the coin is in real life.

In real life the coin looks more like 70% according to that image.

Nice image but I question it's accuracy.

 

 

 

[HelpingHands]

8 hours ago, 5huggy said:

Well thats awesomely superb representation and education thanks "PROFFESSOR" @Au79

We should have a place to put factual stuff like this as "stickies" as a reference bank! @ChrisSIlver

We do.  https://thesilverforum.com/wiki/

[5huggy]

2 minutes ago, HelpingHands said:

We do.  https://thesilverforum.com/wiki/

SHOOT yes - - I have been out of play fer a while  - sorry Boss! 

BUT IM EDUCATED TWICE TODAY and made an A%£ of myself only the once !🙄🤐

[HelpingHands]

I don't think many people know that section is there.

[5huggy]

I was aware but not visited very often - I will remember to point "questioner's" to this in future 👍

[Au79]

With limited information provided on the coin’s provenance, it is realise that the cognitive dissonance between the gold red tone at the mint and the current yellow tone at storage is the reason for the inaccuracy of the alloyed gold colour chart.

7 hours ago, RoughDog said:

I was referring to the Krugerrand which is supposed to be 22 carat, 91.67% gold with 8.33% copper.

That puts it near the top of the triangle which appears a lot more yellow on my monitor than the coin is in real life.

In real life the coin looks more like 70% according to that image.

Nice image but I question it's accuracy.

 

 

 

https://www.goldengates.com/en/why-do-gold-coins-have-different-colours/

https://www.orobel.biz/information/news/fakes-counterfakes-krugerrand