Colored alloys of gold.

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cuchugold
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Colored alloys of gold.

Post by cuchugold » March 15th, 2019, 9:43 am

Hi guys. My daughter has shown some artful/acute interest in jewellery, and I helped her with the basic colors of alloys yellow, red/pink, and green. I'm interested in any comments from people that have actually worked with the blue and purple types shown in the bottom of this table:
https://www.thoughtco.com/composition-o ... oys-608016

Cheers and thanks in advance.
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philddreamer
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Re: Colored alloys of gold.

Post by philddreamer » March 16th, 2019, 2:08 pm

Maybe some good info here...
viewtopic.php?f=33&t=22551&p=236299&hil ... oy#p236299

Take care!

Phil
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Re: Colored alloys of gold.

Post by Keepper1 » April 1st, 2019, 5:10 am

Hello. I am a new member. Nice to meet everyone.

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cuchugold
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Re: Colored alloys of gold.

Post by cuchugold » April 2nd, 2019, 6:16 am

philddreamer wrote:
March 16th, 2019, 2:08 pm
Maybe some good info here...
viewtopic.php?f=33&t=22551&p=236299&hil ... oy#p236299

Take care!

Phil
Thanks Phild. I've done a dozen experimental attempts at the blue (iron+gold), and 5 at the purple (aluminium + gold), and have not gotten a workable jewellery alloy yet. I've put this aside for now. The other alloys are fairly easily obtained.
"Life gets better when we can make life easier for others - do something nice for someone today". KA.
"The difference between a dream & reality is, a good plan!...and execution thereof." PhilD & HAuCl4
"It is always impossible, till it is done".
"Is the juice worth the squeeze?".

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Re: Colored alloys of gold.

Post by goldandsilver123 » April 3rd, 2019, 9:30 am

I've made the "blue" gold alloy. 75% gold 25% iron.
You cannot roll it, I tried and it shattered.

I melted in a eletric furnace under melted borax, must keep O2 away.

The alloy is grey, the blue color comes from an oxide layer from heat treatment. It was like 30s in 500°C oven.
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Lou
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Re: Colored alloys of gold.

Post by Lou » April 3rd, 2019, 11:47 am

A more easily attained blue with indium instead.

Most of these are in fact intermetallics, hence their brittle nature.
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grainsofgold
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Re: Colored alloys of gold.

Post by grainsofgold » April 3rd, 2019, 7:26 pm

Google PM west Refining n Ca call and ask for Daniel -

He has cast purple gold and can give you detailed info -

nickvc
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Re: Colored alloys of gold.

Post by nickvc » April 4th, 2019, 4:53 am

All I can add to your search is that the little I know of those colours of gold is that they are very brittle and working them will be near impossible but casting may well produce a usable piece, the alloys made are very similar in my mind to gold contaminated with 5% or more pgms which fracture very easily.
I knew someone who spent a lot of time trying to make purple gold for inlays into rings and who failed miserably, I wonder whether it could be machined carefully if a rod or bar could be produced, scrap rates would be horrendous so that the items would be very expensive.

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cuchugold
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Re: Colored alloys of gold.

Post by cuchugold » April 7th, 2019, 6:49 am

Thanks all for the responses.
"Life gets better when we can make life easier for others - do something nice for someone today". KA.
"The difference between a dream & reality is, a good plan!...and execution thereof." PhilD & HAuCl4
"It is always impossible, till it is done".
"Is the juice worth the squeeze?".

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