: JBaymore - Viewing Profile

Min, on 20 May 2013 - 12:23 PM, said:

This is true. Thre are a tiny number of people whio actually have a disease whre additional iron would be bad.... but they'd have to use the piece of pottery continually with some sort of acidic material in it to even become CLOSE to an issue.

That being said, if I am remembering correctly Mononna Rossol does mention having knowledge of one legal case where a saturated iron red then oversprayed with red iron oxide on the INSIDE of a coffee mug caused some itron poisioning issues with ........ are you ready for this.... a lawyer who drank coffe out of that mug repeatedly everyday.

But this is a rare exception. (And not exactly a great way to approach the glazing of food surfaces.)

best,

.....................john

oldlady,

I recently arranged the acquisition of a 700+ piece collection of historical works from the estate of a collector for my college, New Hampshire Institute of Art. Works cover a huge range of makers from Adrian Saks to Otto Heino, Don Reitz to Tom Coleman, Chris Gustin to Karen Karnes, and so on. The collector's sister very generously wanted it to go to a place where the use of it in a teaching collection would pass on her brother's love of ceramics to new generations. It is now housed in new cases in the ceramics building as the "Richard D. Murphy Ceramics Collection", and students are benefiting from this wonderful resource.

So if you are not looking at this collection of yours as a potential source of revenue (and need to sell it), and something like a tax deduction instead would be useful.... maybe seek out an institution that you favor and see if they would like to have the pieces. A big "pass it forward". One of my recent "Letters From The President" columns in the Potters Council "Potters Pages" publication focused on just this whole, "What is going to happen to your collection when you are gone" kind of thing.

best,

.........................john

Study hard. Remain a student of clay your entire life. Have a highly critical boss (you). Make lots, keep little. Have exceptional aesthetic and technical standards. Take what you do seriously and make sure others know that. Put in 120% all the time. When all that is done.. .... sell the sizzle.

best,

......................john

I just saw stuff when I was over in Yixing, China that blew me away as to the technical execution..... amazing. Many of which I pondered, "How is this done"?

What if the whole bowl was a very thin bone china, fired to maturity in the ususal slump mold. Then over the translucent body a resist stencil of the pattern was put on and then a opaque white glaze fired to a lower temperature was applied over the resist. So the body only is showing through the area that the stencil protected.

Really...... haven't got a clue. Amazing feat no matter HOW it was done.


best,

..................john

Jim,

I don't know if any of the earthenware suppliers for handcraft type potters are doing this, but an industrial trick to get the glaze on earthenware to go into slight compression (to prevent any crazing) is to deliberately add some of the cristoboalite form of silica into the body formulation. Because it has a very high COE... it helps the body shrink slightly MORE than the glaze (which without lead is typically dominated by hiogh COE alkaline fluxes) and keeps it from crazing. So if the glazing application is uniform and covers all of the clay........ no leaks.

This does not stop the absorbtion of moisture through unglazed areas like the rings of feet. Ot into things like pinholes and other such glaze defects. So microwave use after getting them wet is still potentially an issue.

best,


....................john