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Years ago I bought some pieces on Ebay from China. I bought them because I liked the style and not because I thought they were genuine. They were not advertised as such.
So I was pretty excited when I found out one of the pieces looked like it could be a Tang marbleized jar. It even passed two "tests" I'd read about. These along with how it appeared under a magnifying glass had my hopes up. (Not astronomically so.) Until today.
Today I looked at under a loupe and I noticed something I believe may be a sure sign that this is simply a well done reproduction. Using a magnifying glass the piece has quite a bit of crazing. However when looking at the crazing under the loupe I saw that the lines of the crazing look almost as if they were drawn in with something very narrow. Not only that, the crazing itself looks very flat and even. Like it all happened at the same time. On other pieces which I know are older the crazing as a slight layered look and the lines simply are formed by where the crazing comes together (does that make sense?) You can imagine a piece flaking off.
Am I right in my observation? I don't have any photos of the piece in question. But once I have a place to take a decent photo I will provide one.
I remember someone posting about crazing being chemically induced in modern pieces, I do not know how they do it, but yes, I think the modern crazing would be too uniform. I recently bought a huge cream color warrior jar with bronze lid, with induced crazing, it was not being passed off as anything old, in fact I have found the same jar currently being sold from online retailers. The crazing is also the same inside the jar, so perhaps they coat with liquid of some sort and stick it back in the kiln for another firing?
I believe I have mentioned crazing, so let me add a few thoughts if I may.
First, yes, crazing can be created quite easily artificially. The enamel can simply be made so that when it cools, it retracts (shrinks), then cracks when it hardens. However, generally when this is a feature of the glaze, the crazing is quite uniform both in the spacing of the cracks, and the total coverage.
Natural crazing also occurs due to retraction of the glaze when cooling, but it generally it occurs unevenly / a-symmetrically, and sometimes more so in areas where the glaze or enamel has pooled (thick).
Now, with respect to crazing when it comes to enamels used in the Famille groups, the enamels were not intended to craze, so any crazing is due to a fault in the application of the enamel, firing, or age (or a combination of two or more factors).
When it occurs due to a fault in firing or application of enamel, the crazing is often very fine, forms inter-connecting squares, slightly lifts along the edges of the crazing lines, and the enamel frequently chips off.
When it occurs due to age, the lines are often vert fine, irregular in shape, often spider web like, and darkened by dirt/oxidation. This kind of crazing is caused by subtle changes in climate (temperature and humidity) that cause very minute expansions and contractions that take a lot of time to create cracks. Often, this kind of expansion/contraction occurs in association with water (like someone keeping water in a vase), and the minerals in the water get into the cracks and cause discoloration (rust or other type of impurity that stains).
Can this be faked - sure! But, careful inspection and experience seeing genuinely crazed porcelains as well as fakes will help you differentiate.
@greeno107 Are crazing and crackle different words for the same thing or are they different things altogether?
Hello John,
You might have to go back to about grade 4 when your math's teacher told you every square is a rectangle, but not every rectangle is a square. Or you might want to work out the difference between a Symphony orchestra and a Philharmonic orchestra. Crazing can be used the same as crackle in a positive light if it was an intended effect by the potter. However if the crackle or crazing is an unintended result that can occur due to aging or misuse of ceramic items then it can be viewed as a negative thing. If for example you had an Art Deco vase by one of the noted makers and the glaze has crazed for one reason or another it would be worth less than one that had not crazed.
Deciding if it was intended or unintended can be a tricky thing.
By the way there are lots of you tube video's showing how modern potters create crackle finish on their pots using sodium silicate won't post a link as there are just to many I am sure if members are interested enough they will find them.
Michael
@brettm So what I'm getting from what you're saying is that crackle is always good, but crazing might be good or bad, depending on if intentional or not. And if the crazing is intentional, then it amounts to being crackle. Maybe it would be best if we just use crazing only when it's bad and crackle only when it's good, then it wouldn't be confusing at all! Crazing bad. Crackle good! Ah yes, but if it wasn't confusing then things would be more clear and that would just not work for this field of interest that we all share. So instead, we will have crazing that is sometimes crackling and cyclical dating to keep us all guessing perpetually. Cheers! John
@brettm Thanks for the tip on sodium silicate, I found Justins Makery on You Tube and I'm going to watch him throw some pots and make crackle glaze. Sharon
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