Lili Krakowski on wed 7 dec 11
It is so important to keep small quantities of everything that comes =3D
into the studio...small "samples" that later can be used to check what =3D
went wrong/was improved/changed by new supplies.
Make and keep bisqued test tiles or little test pots of every clay body. =
=3D
Mark them well: "Mitzi's c.4 white : X supplier; Date." Same for every =3D
body that comes or is made in studio.
Do same for raw materials. This shipment of spar, kaolin, iron =3D
oxide...Supplier, date, any ID on sack.
IMO the only way, the quickest way, to identify what and where the =3D
difference comes from.
Right now it looks like likeliest cause of that shivering is a change in =
=3D
the body. BUT if a new batch of the glazes was made up, and a constant =3D
ingredient came from a new supply....
As to bloating: I have encountered it only twice. One was from a black =3D
clay, high in manganese (those were the ignorant days). Diagnosis: a =3D
very tight body, the gases could not escape properly. The other from =3D
carbon coring that probably came from slight dampness, trapped by too =3D
fast bisquing.
When Mel says "Bisque slowly"--oy, is he right. If you do not want to =3D
bisque slowly, then go to once fired, and start that kiln slowly....and =3D
I mean slower than time standing still....
Lili Krakowski
Be of good courage
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