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If the nails are in that tight now, the clay is likely to crack as it
shrinks. A low firing temp (cone 05-06) probably won't hurt the nails. They
will be somewhat oxidized. Steel nails that are galvanized may give off
fumes!
good luck
thom maltbie
Thom Maltbie
South Ripley Elementary School
1568 South Benham Road
Versailles, Indiana 47042
812-689-5383