Strange to read this excerpt from an article, especially spellings chairman of the Belarusian society of collectors ..
Cliché is used in printing banknotes and Ciocana used in coinage metal .... And when coinage used stamp ..

With modern technology, the more strange that the stamp of wear during the minting of a soft metal like gold, and with this limited edition coins, and all the more strange that such a solid company allowed such list of mistakes ... probably just the usual razdolbaystvo ...

All right, I did write only fools are buying gold coins through the Internet, in the markets ..

Oh, and gold coins, tokens Sterligov say Putin himself depicted :) "and they do not rust :)

Rust in the form of dark spots on gold coins.
University of Hannover has studied this phenomenon.
It has been proven without any reasonable doubt that the reason for this change of color. This is very unusual, as some coins of pure gold (999.9 fine gold), and therefore can not be oxidized. With the microscope, the incident light was quickly determined that the point of red-brown color is not allocated to the rise of the coin, and form a layer with the rest of the coin.
For this reason, the affected area was examined with SEM (scanning electron microscope) and determined the chemical composition by EDX [energy x-ray analysis]. The result is an amazing coin of pure gold:
Under the discolored areas (reddish brown spots) is almost pure silver Ag (84%), Cu (10%), Au (5%)
So it's not gold, which reacts chemically, and silver, which begins as silver sulfide respond.
Thus, all the coins will sooner or later pokryvatsya spots that have the inclusions of silver.
The result: perfectly clear that the red spots may also occur for the chemical reactions of gold with 999.9%0.1%parts of other materials in gold, which is part of the gold coins (up to 3 mg /oz), and not only on the coin.

And I do not understand where they come from a depreciation of the copper matrix , which is made from stainless steel.
Gold 999 is scratched with a fingernail, it is very soft ! The matrix must be bad tempered , that would wear such a soft material ! Bad in this hard to believe.