Janet Kaiser on thu 25 oct 01
A question from Washington DC via Wales! They only
check the archives and are not subscribers, but I am
sure they will appreciate any input Clay Buds may have!
I honestly have never heard of adding sodium chloride,
but am willing to learn too! Thanks for any input you
may have!
Forwarded message:
Dear List:
We are researching lime popping which has occurred on a
contemporary British ceramic (fabricated in 1994) now
in our collection. I have read that lime popping can
be avoided with the addition of sodium chloride in
amounts as low as 0.5% of the clay composition. The
ceramic in question has trace amounts of chlorides but
the lime popping still occurred. Does anyone have
experience adding salt to alleviate lime popping? If
so, could you please describe how it is actually mixed
in with the clay and in what quantities? Does the salt
actually prevent the problem entirely or does it reduce
its effects? Alternatively, does anyone have experience
with docking-- wetting the newly fired and still hot
ceramic with water-- to address lime popping?
Anecdotal accounts are welcome.
Could you please respond to me off-list, as well, as I
am not a member.
Thank you,
Stephanie Hornbeck
Object Conservator
National Museum of African Art
Smithsonian Institution
email:shornbec@nmafa.si.edu
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