Detecting Age Faking in Chinese Porcelain
How to detect age faking
Here are additional details to help detecting age faking methods, or at least some of then, mentioned under Porcelain Age Faking methods.
- Old ceramic body with new decoration
This would usually be a decoration newly made on a white, antique
porcelain item, or an item with little or unobtrusive decoration. The
purpose is to lift its value in the eyes of the buyer, as antique items
with decoration are valued higher than plain ones.
Can be detected if colors were used that were only available in a period
later than when the body was made.
- Old bottom and new body
Sometimes a line is visible where body and bottom were joined, or the
glaze doesn't cover the joint completely. (Please note that some
original items like tazzas (stem plate or cup) may show these signs also
because the stem or high foot was joined, rather than thrown with the
plate or cup, before firing.)
Watch for an old bottom attached to a new looking body without any
scratches or usage signs.
- Fake maritime growth and sediments (shipwreck porcelain)
Maritime growth like mollusks, etc. are stuck unto fakes with adhesives.
Fake ceramics are lowered into the sea in fishing nets for some time, until mollusks have settled on these. Requires knowledge of mollusks to detect. Nets are lowered in not too deep water where mollusks are different from those in deep water.
- Acid and glaze deteroriation
While glazes can and do deterioriate while buried in soil or lying on
the bottom of the sea for extended periods of time, always watch for
fake glaze degradation. This can be obtained by immersion in acid. The
glaze may look similar as that of shipwreck porcelain. If the whole item
has been immersed in acidic liquids, this can show on an unglazed
bottom. The bottom will change color and look porous and loose. In some
cases sniffing the porcelain can expose this faking method because of
the residual smell of chemicals.
Two points can help with detecting age faking.
Sometimes bubbles are visible through the glaze. They should line up in
horizontal strings along the the circumference if the clay was thrown.
In items formed by pressing the clay into a mould, the bubbles should
form vertical strings.
If the bubbles in the clay line up vertically from bottom to top when
they should be horizontal instead, this means the clay was pressed into a
In such a case check extra carefully if the item could be a modern replica made with mass production methods using moulds.
With ancient manual production methods the clay often contained bubbles
of different sizes (visible with magnifier). If bubbles are absent or
all uniform and small, this can be a sign of modern production methods.
Many of the old ceramics have visible bubbles that show an uneven mix of
small and larger ones.
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