It seems the reddish colour was painted outside, insde is a little bit white caly. Is that normal? Does a real lamp paint?
It is normal (though not invariable) for both authentic
Loeschcke Type I
lamps and these
Bulgarian copies to have a coloured (typically reddish-brown) coating on the exterior. In authentic
lamps the coating is a 'slip', created by brushing on or dipping into a thin wash of
fine clay. This method appears to have been occasionally used for the
fakes too but very often the wash is merely an artificial paint.
In authentic
lamps the clay used for the core and the slip varied from region to region (providing a useful way of identifying unprovenanced
lamps - though this has not yet been fully analysed) and sometimes from maker to maker.
Both real
lamps and the copies very often have a whitish coating or 'encrustation' inside. In authentic
lamps this coating is typically caused by calcite deposits or catalytic processes in the soil. I suspect that in the
fakes this internal coating is induced and accelerated by swilling the
lamp with thin muddy water or chemicals (perhaps mixed with adhesive), then burying the
lamp in soil for a few months and letting nature take its course. It is amazing how fast a genuine coating can form under burial.
There is a small selection of authentic
Loeschcke Type I
lamps here which may
help you to familiarise yourself with what the real thing looks like:
http://www.romulus2.com/lamps/lampcat/lampcat2.shtmlBy the way how about the market price for this kind of lamp? if there's a real one exists? and what is the price of repro?
Prices vary enormously. Authentic
lamps of this
type can be very reasonably priced and it is ironic that the
fakes often fetch higher prices than the real thing on venues such as
eBay because people think they must be getting a
bargain.
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Regarding the
kylix: I specialise in
lamps and cannot comment meaningfully on objects outside my
area of expertise - except to warn that Apulian
pottery has been notoriously faked for many years and a great deal of this stuff seems to be coming out of the Netherlands at present.
These pages may be of interest:
http://www.collector-antiquities.com/152/http://www.collector-antiquities.com/178/http://www.collector-antiquities.com/198/I would just say that I am particularly suspicious of your
kylix.