The newest advance in silver bullion coin technology is something the
Royal Canadian Mint hopes buyers never see.
The RCM announced Feb. 2 during the World Money Fair in Berlin the
development of Mintshield, a proprietary new process that mint
officials said reduces the occurrence of white spots on silver bullion coins.
All 2018 Maple Leaf silver bullion coins, including the
double-incuse coin and another special 30th anniversary design,
incorporate this new surface protection technology.
Invisible to the eye, Mintshield doesn’t alter a coin’s composition
or purity and can be applied efficiently in a large-scale production
environment, according to the RCM. RCM officials say that laboratory
testing that simulates long-term use has demonstrated that Maple Leaf
silver bullion coins treated with Mintshield successfully resist white
spotting compared to all other silver bullion products in the market.
As of 2018, all Maple Leaf silver bullion coins are enhanced with
Mintshield surface protection.
White spots (also called “milk spots”) are surface discolorations
that sometimes mar the appearance of silver bullion products.
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Unlike tarnishing, which is a byproduct of oxidation, white spots
don’t have a single predictable cause and this has complicated the
search for an effective solution to the problem, which affects silver
bullion coin producers all over the world.
Mintshield technology is the latest advance for the RCM’s silver
Maple Leaf program.
The new technology joins features such as Bullion DNA
anti-counterfeiting technology, laser micro-engraving and the Maple
Leaf’s distinction as the first .9999 fine silver bullion coin.
“The Mint has a long history of revolutionizing the bullion industry
with advances in purity and security, and Mintshield is yet another
exciting step in that direction,” said Sandra Hanington, president and
CEO of the RCM, in a press release.
RCM officials have not disclosed additional details about the use
and application of the surface treatment.
The development springs out of a decade-long commitment to research
and development that includes the development of the aforementioned
DNA technology, “Digital Nondestructive Analysis” that allows dealers
to verify the authenticity of silver and gold bullion coins with a
desktop machine linked to the RCM’s database.
To learn more about Mintshield, visit a special page on the RCM's website.