Modern kilns use gas without fly ash and temperatures can be more closely regulated.Some experts detect by feeling, a grittyness or lack of smooth glazing.
Generally, authenticity is given to an object by an expert in the field.
It is based on that person's credibility in the field, comparison to similar objects, previous ownership (provenance) and documentation.
We feel this is a very important section of our Canton museum.
As long as there have been art and antiques, there have been problems verifying what is authentic.
Three definitions are in order:---We define Canton fakes as pieces deliberately made to fool buyers, and most if not all have been made recently in China.
They follow a known Canton form as closely as possible; however, mistakes are made in the details or they are made of lighter or heavier porcelain than a comparable form or they are too perfect without any blemishes or signs of wear.
Shown below is an example of a fake square canister on the left along side a real one. Some differences are readily seen: the fake's top is not domed and on the underside there is no overhang.
The fake's inside top rim is thicker than the original's rim.
This fake category of "Canton" is often the hardest to distinguish.---These are the second easiest to detect as they do not resemble any known antique Canton forms.