PATINA is form like a tree bark. The tree bark is not formed overnight. it also take decades.From the inner layer called the : Cambuim cell layer to Inner Layer and finally to External layer which enable us to tell the ageing process of the tree and the age of the tree.
Therefore, if you want to know whether the antiques ; coins; artifacts are real genuine or fake, the first step is to identified the existence of Patina's presence in the product.
The British bronze coin dated in 1866 is consider relatively young coin. That is why there isn't any trace of Patina found on the coin's surface.
Below is the coin from one of the Qing Dynasty which was dated around 1644AD to late 1800. It is also consider pretty young coin. That is why there isn't any trace of Patina found on the coin's surface.
These coins are from ancient Israel 
dated around 25AD to 220AD . Thin layer of Patina can be found on these coins.
Here is another coin from the Zhou Dynasty dated between 11th BC to 770BC. It has a visible layer of Patina on the whole coin. The color tone of the Patina from light to dark greenish indicate the ageing process .
The Patina Color which is light green found on the bronze statute of the liberty was a man-made chemical process patina. These man-made Patina's coloe re-created look-a-like real patina.
dated around 25AD to 220AD . Thin layer of Patina can be found on these coins.Here is another coin from the Zhou Dynasty dated between 11th BC to 770BC. It has a visible layer of Patina on the whole coin. The color tone of the Patina from light to dark greenish indicate the ageing process .
The Patina Color which is light green found on the bronze statute of the liberty was a man-made chemical process patina. These man-made Patina's coloe re-created look-a-like real patina.However, to prove whether it is real or fake is to take a scatch on the patina and check on its layers. A man-made Patina only have a surface coating. A genuine Patina will have multiple layers Patina coated. It will proves its authenticity.
One of the first basic step to collect ancient coins is to understand some basic metal appearance that changes from time to time.
And the first thing to take note in order to determine whether the coin is genuine or fake is by tracing for the existence of : PATINA which are found on the surface of the coin-metal.
Patina (ˈpa tə nə) is a film on the surface of bronze or similar metals, produced by oxidation over a long period, sheen on wooden furniture produced by age, wear and polishing, or any such acquired change of a surface through age and exposure. On metal, patina is a coating of various chemical compounds such as oxides or carbonates formed on the surface during exposure to the elements (weathering). Patina also refers to accumulated changes in surface texture and colour that result from normal use of an object such as a coin or a piece of furniture over time.
Appearance of Patina: Different tones of greenish color. From light to dark green to deep ocean blue-green.
The green patina that forms naturally on copper and bronze is known as verdigris and consists of copper carbonate.
One example of a patina is a green surface texture created by slow chemical alteration of copper, producing a basic carbonate. It can form on pure copper objects as well as alloys which contain copper, such as bronze or brass.
One example of a patina is a green surface texture created by slow chemical alteration of copper, producing a basic carbonate. It can form on pure copper objects as well as alloys which contain copper, such as bronze or brass.
PATINA give the authenticity value of these ancient coins and artifacts:
Apart from the aesthetic appearance and practical protection of patination, antique experts confirm that an object's value increases when its patination is intact because it is an important effect of the ageing process and this evidential history is reflected in the value of the piece.
In terms of antiques then,Patina is everything that happens to an object over the course of time. The nick in the leg of a table, a scratch on a table top, the loss of moisture in the paint, the crackling of a finish or a glaze in ceramics, the gentle wear patterns on the edge of a plate. All these things add up to create a softer look, subtle color changes, a character.
In terms of antiques then,Patina is everything that happens to an object over the course of time. The nick in the leg of a table, a scratch on a table top, the loss of moisture in the paint, the crackling of a finish or a glaze in ceramics, the gentle wear patterns on the edge of a plate. All these things add up to create a softer look, subtle color changes, a character.
Can Patina be found in modern coin?
No, it take decade to create this natural substance which grow on the surface of bronze material.
Therefore, it is easy to differentiate between fake and genuine coins and artifacts by trace of Patina.
However, there be possible trace of Patina found on modern coin. Nevertheless, the Patina thickness and its color tones cannot be compare to those Patina which already grown on the ancient coins or artifacts can tell the ageing process of the product. A genuine Patina ageing process can be tell by its layers process found on Patina layers. A man-made patina will not have such ageing layers.
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