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: water content of clay and drying out pots for biscuit firing

updated mon 26 nov 01

 

iandol on sat 24 nov 01


Good point David,

I have such a pot that I treasure, An Ivy Planter in the form of a =
slender Nude. Had the defect not occurred it would have been sold years =
ago.

The original weight of the clay does not really matter. What you have to =
look for is the way the weight changes each time you put your pot on the =
scales. When the difference between two successive readings is down to =
zero, or nearly so you will have reached that condition. But you cannot =
remove water which is attributable to atmospheric moisture form a porous =
material, so there may be slight variations due to humidity in the air =
at a particular time or in a particular place.

Even if it seems dry, precautions still need to be taken. Water which =
forms during the decomposition of clay needs time to diffuse out into =
the atmosphere. Even as an expanding gas it can create problems.

Best regards,

Ivor Lewis, Redhill, South Australia