How to test pottery

Go down

How to test pottery

Post by dantheman on August 12th 2011, 10:45 pm

We all know how to test for damage..or do we?
I for one have always wondered about ringing a pot to test for cracks,does it work on all shapes and sizes? and what is the best way to hold odd shaped pottery so it resonates properly?

_________________
avatar
dantheman
Consultant
Consultant

Male Number of posts : 13461
Location : Lincolnshire ( the veg patch of England)
Registration date : 2008-02-03

Back to top Go down

Re: How to test pottery

Post by Potty on August 12th 2011, 11:36 pm

It works for a lot of shapes and sizes, but the tone you expect to hear changes from pot to pot.

For example if a pot has a lot of crazing, it will make a thud, but it will make a much worse crackly thud if it is cracked.

The body of the item is also very important to the tune you expect to hear. Hard paste porcelain makes a very nice ring, much like that of glass.

Earthenware makes a bit of a thud, but again much worse when actually cracked.

The test is mainly used to detect hairline cracks and often a chipped item will ring quite nice.

You need to make sure to hold the item so that you do not dull the sound with your hands.

I rest most items across the tips of my fingers (as little finger as possible).

It is by no means foolproof and a test I use as a quick detection, but still check an item toughly after, more so if it sounds like it may be cracked.

It's not the be all end all test it has sometimes been made out to be on the telly.

If it is a solid item I doubt this test would be of any use.

Regards,

Potty.

_________________
lozzy68 wrote:I Had A Feeling It Wasn't A gnome As Studio-Pots Said There Is No Hat On Him
NaomiM wrote:I'm watching other Willies, so maybe I'll get one at some point.
studio-pots wrote:I know my raku Happy
avatar
Potty

Number of posts : 3453
Location : Midlands
Registration date : 2010-09-28

Back to top Go down

Re: How to test pottery

Post by Potty on August 12th 2011, 11:38 pm

By the way, the best way to understand this is to start listening to pots that you know to be perfect and ones that you know to be cracked.

_________________
lozzy68 wrote:I Had A Feeling It Wasn't A gnome As Studio-Pots Said There Is No Hat On Him
NaomiM wrote:I'm watching other Willies, so maybe I'll get one at some point.
studio-pots wrote:I know my raku Happy
avatar
Potty

Number of posts : 3453
Location : Midlands
Registration date : 2010-09-28

Back to top Go down

Re: How to test pottery

Post by dantheman on August 13th 2011, 6:24 am

does anyone use UV light to test for restoration?

_________________
avatar
dantheman
Consultant
Consultant

Male Number of posts : 13461
Location : Lincolnshire ( the veg patch of England)
Registration date : 2008-02-03

Back to top Go down

Re: How to test pottery

Post by Potty on August 13th 2011, 7:42 am

Requested by Dan:

To look for restoration, you examine an item for a subtle change in colour and / or consistency on the item.

If you believe there could be restoration on an item, you can use the following test.


Testing for restoration using your teeth:

Press the restored area gently against the enamel of your tooth, if it feels soft compared to the rest of the pot, chances are it has been restored.

Pressing with a nail also works, but you need to be more sensitive to notice the difference, it is a lot more apparent with your teeth.

Be careful not to press to hard, as the restoration can be easily damaged itself.


This test is very good, but if the item has very light restoration (e.g. thin coating over a hairline crack to disguise the damage can sometimes seem as hard as the body of an item) it can still be difficult to know either way.


Potty.

_________________
lozzy68 wrote:I Had A Feeling It Wasn't A gnome As Studio-Pots Said There Is No Hat On Him
NaomiM wrote:I'm watching other Willies, so maybe I'll get one at some point.
studio-pots wrote:I know my raku Happy
avatar
Potty

Number of posts : 3453
Location : Midlands
Registration date : 2010-09-28

Back to top Go down

Re: How to test pottery

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum