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Marcia Selsor

Member Since 16 May 2010
Offline Last Active Yesterday, 07:54 PM

#109333 Help! I Can't Center Anymore!

Posted by Marcia Selsor on Yesterday, 04:51 PM

Either that or the outside is tougher than the inside. You can solve that by dropping a fresh bag of clay on all sides, maybe even several times. That moves the thixotropic effect of some clays. Have you ever noticed the clay has a harder spot in places. Try this and see if that doesn't help solve the problem. I just came in from throwing some older Cassius Clay. I dropped it on the floor and it softened up. easy to wedge and throw.

#109331 Help! I Can't Center Anymore!

Posted by Marcia Selsor on Yesterday, 04:39 PM

if the clays have gotten a little hard, slide the pugs like bread, dip each slice in bread, rebag and let them sit overnight. That will soften them for wedging and throwing as Marko suggests above.

#109298 Large Flat Pieces Cracking During Glaze Firing

Posted by Marcia Selsor on 23 June 2016 - 10:39 PM

nerd, Fred thinks you should read the crystalline glaze article in the latest PMI.
I am considering giving it a go. I think I have 20or 30 pounds of that old frit.
I will post some of my old crystalline pots. I have one in the Springfield , Illinois State Museum that was
A deep navy blue with electric blue crystals. I had a tiny vile of uranium nitrate.

#109236 Qotw: Would You Laugh At Me If I Told You That I Am Using A Gg?

Posted by Marcia Selsor on 22 June 2016 - 11:41 PM

Tapping to center using a wet lip to stick the pot to the wheel is a fast way to trim. Works best with a good stoneware imho. I agree people should learn the basics , then develop using tools as needed in your work practices.

#109176 Qotw: Would You Laugh At Me If I Told You That I Am Using A Gg?

Posted by Marcia Selsor on 22 June 2016 - 08:06 AM

I have been using a Griffin grip for about 15 years for holding various-sized chucks for trimming my orbs. It makes it fast to switch chuck sizes. I also use it for when I apply terra sig. I support small pots off the bat and can invert them to do the other side. Really speeds up the process.


#109163 Large Flat Pieces Cracking During Glaze Firing

Posted by Marcia Selsor on 21 June 2016 - 09:50 PM

I fire these vertically.. Not flat on the shelf. They are flat ,no warping usually. largest dimension has been 25"

#109098 Large Flat Pieces Cracking During Glaze Firing

Posted by Marcia Selsor on 20 June 2016 - 09:31 PM

I use the coils in the raku glaze firing as well. Heat circulation is critical and I think quartz inversion is also affected by uneven heat which causes the cracks.

#109006 Just An Other Newbie

Posted by Marcia Selsor on 18 June 2016 - 09:32 PM

welcome to the forum which is also a bunch of those in love with clay. So welcome to like minds. Glad to have you aboard. You are already off to a great set up with a wheel and kiln.

#108982 Video Of Traditional Pots From Agost

Posted by Marcia Selsor on 18 June 2016 - 04:32 PM

This is one of several videos of the pottery town of Agost near Alicante in Spain. lived there for a year while studying traditional potters and visiting 48 pottery manufacturing centers around the country.
The museum there is moving to a larger facility.
This video is from La Nava Pottery. The moved to an updated facility in 1980 or so. They had a 4 story kiln with a freight elevator. Wood-fired. Capacity is about 11,000 pots per load.

Hope Mark likes the tumble stacking
  • Min likes this

#108819 Qotw: What Is Your Biggest Safety Fault?

Posted by Marcia Selsor on 15 June 2016 - 09:22 PM

i don't always wear safety goggles when checking my raku firings.I have a good pair that I have had for years, but sometimes I don't use them. Not good. I should be better to me eyes.

#108818 Framed Mosaic Pricing?

Posted by Marcia Selsor on 15 June 2016 - 09:10 PM

Attached File  borderfencesmall. copy.jpeg   49.82KB   1 downloadsI have one with four tiles. Total size is about 34 x 34"
I value it at $1000. i would add I have pieces in museum collections in 11 countries, work in books, articles, etc.


#108812 Majolica Decoration - Colored Areas Have Strong Texture

Posted by Marcia Selsor on 15 June 2016 - 07:11 PM

The recipes I have used fire to ^03, 2014 F or 1104 C.

The pasted info below is from Arbuckle's 2007 handout

Majolica and Lowfire Information
Majolica (Arbuckle) Cone 03 Cone 05 + ½ - 3+ tbsp. Epsom salts. to 5 gallons of glaze (flocculates the
glaze for less settling and better application). Smooth, white,
opaque. Colorants w/flux usually applied in a thin wash to raw
glaze surface. Does not move in firing. May crawl if thick in
corners or pinhole over rough-trimmed surfaces. Fire w/small 03
cone in the sitter to give a small 04 tipped to about 2 o'clock in
front of the peep hole. Use of chrome in decoration may cause
sufficient fuming to make the background blush pink in high tin
glazes (above 5%). If this is a problem, drop the tin a bit, and add
that amount x 1.5 of additional zirconium opacifier.
frit 3124 65.8 66.6
F-4 feldspar 17.2 23.0
EPK 10.8 2.3
neph sy 6.2 8.1
100.0 100.0
+ tin 4 4
+ zircopax 9 9
+ bentonite 2 2
Majolica Colorant Suggestions:
Gerstley borate is no longer being mined, and was erratic in quality when it was. It made color pastel through very
fine reticulation (break up) on the surface, and although I used GB when I began majolica, I now use frit as a flux
(with bentonite added) or commercial majolica decorating colors. Colorants with just frit settle quickly, have
limited brushability, and are very powdery dry. Some artists, like Matthias Ostermann, use this quality to work the
surface like pastels. My methods resist the motifs with wax before a solid ground color is laid in, and the addition
of bentonite or use of CMC gum to the frit + colorant mix aid brushing and hardens the dry surface. Bentonite
doesn’t mix easily w/water, so be SURE to mix dry bentonite, frit, and colorant first, then add water.
I use frit 3124. Others will work, with color reactions influenced by frit chemistry. To aid brushability, you may add
a small amount of glycerin (drug store item), or a few drops liquid CMC gum to the liquid mix.
For things that melt easily at low-fire temps (copper, cobalt, iron) try 1 part colorant, 1 frit, 1 bentonite by volume.
For more refractory ingredients, test 1 colorant, 2 frit, 1 bentonite.
1 part colorant, 1 frit, ½ - 1 bentonite 1 colorant, 2-3 frit, ½ - 1 bentonite
Copper (blue-green), cobalt (blue), manganese
(brown to plum w/3110), iron (brown)
Chrome (grass green), rutile (rusty orange), titanium
(ivory), most stains
Note that stains intended as “body” stains – to color clay bodies – are too refractory, even w/flux added, to make a
smooth surface on top of majolica glaze. Some of those stains: Mason 6020 Manganese-alumina pink, Mason 6485
Titanium yellow, one of the lavender Mason stains. I find that Vivid Blue is also rather refractory.
Some AMACO Velvet underglazes work for decorating on top of majolica base glaze: Mist Grey, Jet Black, Rose,
Maroon, Leaf Green and 350 Orange, Amethyst, Violet, Real Orange, Lt. Red, Red. Too refractory to use: Electric
Blue, Pearl Grey, Ivory, Hunter Green, Deep Yellow, Straw, Lt. & Med. Pink . Test others.
AMACO now makes a series of colors specifically for majolica decoration, the GDC series of products. Good range
of 36 colors. They work well right from the bottle for decoration on top of the base glaze. Prices for small jars are
$3.50-5.75, pints $12 -38.00. The colors will inter-mix, but as with the colorants they are made from, some are
strong colors, others weaker, so you may need to test amounts. E.g. 3-4 parts Yellow and ½ - 1 part turquoise
makes a nice chartreuse.
Linda Arbuckle Majolica and Lowfire Information http://lindaarbuckle.com
Page 2 of 10
Soluble colorants: cobalt sulfate (blue), copper sulfate (turquoise), manganese chloride (plummy brown), chrome
chloride (green). All are toxic raw. Do not inhale, ingest. They are also absorption hazards: do not handle these w/o
gloves. Soluble colorants are dissolved, rather than suspended in water, so they wick with the water making a very
uniform ground color and leave a soft edge,. If you want a white areas, or to retain motif colors, areas must be
waxed before applying soluble colorants. Over-wetting the glaze when applying solubles may move raw glaze and
cause color to migrate thru the pot wall and/or crawling. Too much water on the raw glaze may cause crawling in
the fired glaze.

#108686 Outdoor Sculpture Claybody Questions

Posted by Marcia Selsor on 14 June 2016 - 09:29 AM

In some cases glaze can spall if moisture gets behind it and into an absorbent body. I don't know of any commercial clay that fits the bill but maybe a terra cotta fired to a higher end temperature like ^01- ^3 depending on its range. You will need to test.

#108671 Website Development, What Do You Use?

Posted by Marcia Selsor on 14 June 2016 - 07:03 AM

Nice website, Lee. And great picture of you.

#108624 Website Development, What Do You Use?

Posted by Marcia Selsor on 13 June 2016 - 10:18 AM

Go Daddy just increased their security at the demand of Google.
BTWW Life photos are very complimentary to your work. Well done. That is not easy to do.
Chilly, It tells me to open cookies otherwise can't find it. Currently have cookies off because I find them annoying when I read the news.
Pres, I need to blog but don't want to spend the time either.
Pugaboo, where is you link to your website? I have the basic web builder for Go Daddy I after Dreamweaver, Sandvox,and some others and basic html in the 90s, I find the Go Daddy great for changing , updating. etc. I had not done much serious reorganizing for about a year and forgot a couple of details, but when a figured out what I had forgotten, it was a breeze.