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blackening crackle

updated fri 21 dec 07


mel jacobson on thu 20 dec 07

i did that a great deal about 30 years ago.
i found a glaze that produced a very large crackle
affect..esp thickly applied. (old, 1234, celedon. leach.)

i removed the pot warm from the
used heavy leather gloves and an old towel.
set it on brick and used a very hot india ink (high carbon ink).
i heated the ink
in a microwave that i have in the studio.
i brushed the hot ink/slathered it...over the pot.
put it back in the kiln...let it cool naturally.
( i put the selected pots in easy reach at the door side of the

the hotter the pot, the larger the the pot cools
the crackle turns to crazing...small cracks.

when the pots are put them in the kitchen
sink...soak in water for a few minutes and use a brillo pad/3m plastic
pad or such,
to remove the surface ink. scrub hard.
the crackle has sealed the ink into its core.
it does not come out.

i did that for a few firings with great success...but, once you
do it...and it works, it gets old fast. sort of fake antique.
so...i dropped the idea.

i have one pot that i show folks that i say...`this is a
late sung dynesty pot i have...` `who, ahh...really nice...
boy, that baby is old.` then i show them my stamp...
` fooled me on that one.`.
so, that got old fast. i added a pix of that pot on my clayart
website. click is on the bottom of the page.

i have seen potters take a warm pot and put it in a warm solution
of thick tea, coffee, ink laced water...etc. soak it for a few days...turning
once in awhile. it produces a weak color...but nice. you see those
pots in antique shops in the far east...bangkok..etc. they are about
three days old...and sell as very fine antiques. always check the clay
surface...foot ring. that is the key to old.

from: mel/

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