search  current discussion  categories  materials - misc 

wax or not?/

updated tue 31 oct 00

 

Karen Sullivan on mon 30 oct 00


Mary...
If the definition of ceramic materials is how those materials respond to the
affects of heat....Wax is gone-vaporized-history at 350-400 degrees. It is
great for resisting the glaze while decorating, but will do nothing to
prevent the glaze from running. The glaze gets molten at about 2000 degrees.
What I do is bevel the glaze edge with a damp sponge so the glaze is thinner
at the bottom level(about 1/4 inch) and if it runs has to travel and thicken
down the side of the piece to get close to the kiln shelf. Does that make
sense. Visualize a triangle, place the triangle against a flat plane, the
point of the triangle is at the bottom...the glaze varies in thickness from
the bottom...getting thicker as you move up the plane of shape of the piece.
I accomplish this with a wet sponge, stroking in one direction from the
bottom in an upward direction to clean off the glaze.
Hope this helps.
bamboo karen

on 10/30/00 9:38 AM, Crabtree, Mary B at meb3@CDC.GOV wrote:

> Hi,
> I'm new to the list as well as being new to pottery (~10 months)...have been
> getting a lot of useful from reading posts on the list but only now
> subscribed as I have a problem I need some advice on. Any info or
> suggestions will be appreciated. Its probably an age-old question, but here
> goes.
>
> I was taught to simply wipe glaze from foot rings on pots to clean them off
> before firing to prevent sticking to the kiln shelves. Most of the time
> this works fine, but I've been working with a couple of glazes that seem to
> be particularly runny, yet beautiful, and my last glaze firing resulted in 3
> really nice pieces that melted onto the kiln shelves.
>
> I've read that many potters use wax on foot rings. What's the consensus on
> this? Will waxing up the side of the pot a bit keep the glaze from running
> onto the shelves better than just removing an area of glaze? If you do wax
> the rims do you use the same type of wax as used in glaze decoration
> techniques? Do you brush it on (I'm not good with brushing a straight line)
> or do you dip the bottoms of your pots in the wax?
>
> Thanks in advance for any suggestions...
>
> Mary
> meb3@cdc.gov
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>