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Pillar of the Community
Philippines
1156 Posts |
would like to collect more holograms, this is my first hologram a 2002 Spain 12Euro, silver 0.925 coin. Its hologram changes from "02" to the euro symbol "E" Is there any other coin you know that has this hologram feature?    Edited by Nic
11/19/2009 05:32 am
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Moderator
 Australia
16817 Posts |
This isn't technically a hologram, nor is it technically a "diffraction pattern", a term I sometimes lazily use to refer to the effect. It's proper name is a "latent image".
It's created by carving very fine grooves into the die in one direction for one symbol you wish to appear (in this case, "02") and carve very fine grooves at 90 degrees to the other lines for the other symbol (in this case, the euro symbol). The fine lines are transferred onto the coins when the coins are struck, and the different patterns show as light reflects (or not reflects) off the sides of the grooves, depending on the angle the light is striking it and the angle you are viewing it at. Get a magnifying glass and you'll see the very fine grooves. It's something that would have been impossible to achieve in the days before computer-controlled die-cutting.
It's been used for some modern circulating coins, particularly high-value ones; it's a simple, low-tech anti-counterfeiting device (as I said, you need sophisticated die-cutting gear to reproduce the effect properly). The British £2 coin has one in the "central spot"; the Polish 2 zlote 2000 likewise. The newest versions of the Japanese 500 yen have latent images inside the zeroes. The Taiwan $50 is brass but the latent image in the centre gives it a "pseudo-bimetallic" look.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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Pillar of the Community
United States
2797 Posts |
If you're interested in true holograms, check out the Canadian Mint offerings. They have some beauties.  |
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Pillar of the Community
United States
2605 Posts |
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Pillar of the Community
 Philippines
1156 Posts |
Thank you sap for the info, yes, saw the grooves with a loupe, they must change dies often? thanks seatednut for the lead... svslav, that's a fantastic link! that king penguin crystal coin is a jewel! thanks all! |
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Pillar of the Community
United States
2669 Posts |
Quote:
If you're interested in true holograms, check out the Canadian Mint offerings. They have some beauties.  The "Tall Ships" series is absolutely beautiful! |
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Pillar of the Community
Philippines
1156 Posts |
copy, thanks xshift! will do!  |
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Bedrock of the Community
United States
10284 Posts |
I received this 12 Euro last year from my Secret Santa manilagalleontrade right here on CCF from Spain. Mine has a pair of hands and when turned also shows 0 8 like your 0 2. I am not sure, but this has a good amount of silver content.   |
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Pillar of the Community
Philippines
1156 Posts |
nice pair of hands there! figuratively the right hand has "0" and the left hand has an "8" yes it's 92.5% silver, but I am not sure of the weight at 25grams? |
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Valued Member
United States
220 Posts |
How about the Canada lunar hologram coins?   (pictures by the Canadian Royal Mint). |
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Bedrock of the Community
United States
17884 Posts |
If you want real coin holograms, there was a TPG service in Ohio back in 1986, the era of the Photocertificates, that rather than using photos used holograms of the certified coin. These were white light holograms so they didn't need lasers to view them, they could be magnified to check for contact marks etc to make sure the coin matched the certificate. Most interestingly as you tip the hologram you can also check out the luster of the coin as it cartwheels. (Try doing THAT with a photo.) Bad side is that like all white light holograms it suffers from false colors, basically red and green so you can't see the true color of the coin. They are really neat, unfortunately they also seem to be very scarce to rare. |
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Valued Member
United States
56 Posts |
The Hungarian 3000 Forint 2000 Commemorative has a hologram as well as Gábor Denes (1900-1979), a Hungarian and inventor of the hologram. I think the coin is cool but I have never seen one for sale. I think it was originally sold for about 60 bucks but don't quote me on that.
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Replies: 11 / Views: 2,035 |
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Posted 11/19/2009 10:05 am
