Blue kookaburra's where do they come from?

After a long while searching i found a blue colored coin again; now it's not a blue kookaburra but a very nice toned blue Lunar 1 year 2000.

Very nice coin i think...

3605_lunar_blue_2000.jpg
 
just put 'em in a container with some burning sulphur (smoke) and they'll tone in front of your eyes... be creful though... a few seconds too long and they'll go black.
 
I don't believe sulphur is the way these coins are made or any way written in this thread;

the quality is so consistent and the back is totally normal silver this must be prifessional done.

I'm looking for anybody who nows reaaly about how they are mader, but did not found any yet..

Still they are beautiful coins i think..
 
haakma said:
I don't believe sulphur is the way these coins are made or any way written in this thread;

the quality is so consistent and the back is totally normal silver this must be prifessional done.

I'm looking for anybody who nows reaaly about how they are mader, but did not found any yet..

Still they are beautiful coins i think..
Click to expand...

Source Coin Web:

OXYGEN COINS
In recent years, a number of altered Australian bullion silver coins have appeared on the market, particularly in Europe, sold as 'Oxygen' coins.

The coins, mostly one and two ounce kookaburra series specimen issues, exhibit a rainbow-like colouring (patina) of the field.

The effect is created by heating (roasting) the coin in an oxygen-rich enclosure. The oxygen reacts with the surface of the coin to create a variable depth layer of silver oxide (AgO). When light strikes this translucent layer, it penetrates to differing depths before refracting, depending on the amount of silver oxide laid down.

The varying depth of the silver oxide layer across a single coin is achieved by two factors working together - stress and heat. The more that the silver has been stressed, for example in the frosted field of specimen bullion coins, the more that the surface of the silver will oxidize. Uneven heating causes oxidation to proceed at differing rates across the coin, producing a patina with colour gradations.

The following 'Oxygen Coin' examples have been seen -

1991 1oz Kookaburra Near Tree Trunk.
1994 1oz Two Kookaburras.
1998 2oz Kookaburra on Fence.
2000 1oz Kookaburra on Branch.
2000 1oz Lunar Dragon.
2002 2oz Kookaburra over Map.
2003 1oz Kookaburra on Branch.
2003 2oz Kookaburra on Branch.
 
I had the unique chance to buy a total set of 1 oz Blue Kookaburra's; and i got some more information about the background of them; the series is made by a German professional as a one go in the year 2005; so the 1 oz blue Kookabuura is from 1991 until 2005; i suppose from the 1 oz lunar it is the same. From every coin there are 250 made. I not know the name of the dealer yet and the reason why he made them, so wenn anybody can help i would be very glad; but i can say now that i have the 1 oz blue kookaburra more then complete :P

3605_blue_kookaburra.jpg
 
Very nice! How much did that cost? Far more interesting than all silver. Maybe even more appealing to some?
 
Yes in real they are way more pretty because they chance color in the light, for me the most beautifull coins i own.

But inmy collection it is a little obsession, i pay for them whats asked, so it costed me almost a thousand euro's for the 15 coins..

It seems like much but you almst never see them on the internet or ebay, so when there is one, it is mine :cool:
 
Seems to me a good way to hide the damage on the coin,s make them blue in a chemical proces Holy S..t
 
I remember that around 2004-2005 some german private company made such coins with a chemical process and called them "oxygen" or something. I think that they are more beautiful and unique but, it is nothing official, something like the colored/gilded/hologrammed silver eagle or maple leaf by private mints today.
Alex.
 
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