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Marcia Selsor

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Posts posted by Marcia Selsor

  1. this is not a Roman arch , but a sprung arch. Roman arches are semi circular running into the wall without a scew brick.  A. P. Green handbook for designing arches helps you configure the rise per foot and the radius and what bricks are needed to construct the arch as well as which stew brick is needed. great little reference book.

    Car valve springs from junk yards  do contract and expand. Used them for decades.Springs from a hardware store are not as resilient. That may be what mark is referring to.




  2. I have used small bits of fiber soaked in ITC and stuffed into the cracks. Possibly a kiln patch material would also work. 

    Question: is the kiln frame rigid? I always built arches using a threaded rod , large washers and car valve springs to allow the arch to breath  (expansion and contraction) . Just curious if that could be the source of the problem. -no flexibility.


  3.  I have instructions for making raku kilns. https://www.marciaselsorstudio.com/raku--latex-resist---making-raku-kilns.ht     I have a dvd from Acers/CAD regarding the potential firings of a raku kiln including: obvert, sagar and foil sagger firings. I enjoy the immediacy of the raku kilns and how many ways it can be used.https://ceramicartsnetwork.org/shop/raku-firing-with-marcia-selsor/  there are links on my website that have videos from this dvd.


  4. here is my former teacher's (Bill Daley) clay body. He fired it at a brick yard conveyor kiln. Daley's is toasty golden, Linda's is rich and deeper color, and David's is the reddest. If you search the Ceramics monthly Archives for an article with Daley and Wright you could see examples of their pieces. Daley's and Linda's are more for hand building. Wright's can be thrown.

    I just noticed the above link has examples of Daley's clay body.


    Bill Daley's Body ^6 tight Clay Body

    Ball Clay                   13.33%

    Cedar Hts Red Art  40

    Fire Clay                   20

    Newman Red Clay   26.67


    Barium Carbonate  1% dissolve in water

    Grog                        10%



    Linda Blossom' ^6 Clay Body

    Hawthorne Fire Clay    35

    OM #4 Ball Clay            20

    Newman Red                  20

    Fine Grog                        20

    Silica 200 mesh               15

    G200 Feldspar                10

    to glaze green use .5% vee gum in glaze



    David Wright ^6 Clay Body

    Ball Clay                    10%

    Cedar Hts. Redart     30%

    Fire Clay                     20

    Newman red               40


    Barium carb.                1%

    Bentonite                      1%

    Fine Grog                    5%

  5. I have used very fine silicon carbide to achieve copper reds in ^10 oxidation without much spotting. If you want the copper spotting as on the first pot, you might try copper granules and fire the pot in a saggar for the glaze firing and include some charcoal briquets, Someone was discussing saggars in reduction on here in the past year or so.



  6. I had a friend receive a large quantity of chemicals from a family of a deceased potter. It was going to cost the family about $10,000 to throw away the chemicals which would have to be tested for toxic disposal. You might explain that to the family when you make your offer. That is a lot of good chemicals some of which are extinct.

    I'd like to suggest to old potters out there to consider leaving your studio chemicals to someone so the family doesn't have to deal with disposal costs. There are lucky to find Roberta.


  7. Building a catenary arch support isn't difficult. Figure the size you need ( base it around the shelf size you'll be using). Get a chain , mark the dimensions height and width and nail the chain to reach those dimensions. Spray paint 3 pieces of plywood. cut it out with a jigsaw. Build it well. install on site raised on shims  that afterwards it will drop the form and slide it out of the form.



  8. I built a castable one like the catenary in Ruthanne's book. I have also fired with her. She sprays in dissolved soda ash. I would recommend learning to fire a kiln and the go to soda.  Firing soda has more temperature fluctuation in between applying soda into the kiln. We fired the soft brick kiln at La Meridiana back in 2000. That kiln lasted over a decade. They must have been high alumina soft bricks. They have rebuilt a new one again with soft insulating bricks. 



  9. I got a warning that I am almost out of space in my members gallery. I would like to delete old images. I can't even find my gallery. Could someone give me directions? I was going to post an image of a cobalt green glaze in response to a forum question. I also have posted the recipe in the gallery. I could not find it. It is in my album "Forum Discussions" but could not find it.



  10. I lived in Spain and researched the folk pottery there. Adra is on the sea...your shard could be anything from Phoenician , Greek, Roman, Carthagian, Moorish, medieval or contemporary sea-washed earthenware.  There is a great maritime museum in Cartagena , Spain. They have a great collection of amphoras and pots that came out the the bay right there.  Just about every mediterranean culture traded by sea. You an find shards everywhere along the coast.


  11. I use quick terra sig. Apply when bone dry and burnish with a soft makeup sponge or foam. 


    250 grams of ball clay or any fine clay including red art  into a liter of water in a plastic bottle. If digging clay, weigh 200 grams and ask for a few hours before mixing with the water. Shake well. Add a few drops of Darvon 7 or Darvon 833. Shake well. Let it settle for about 2 hours. Punch or slice a hole in the bottle above the line where the heavy materials settled. Drain into a container. 

    Brush or spray onto the pot. Burnish with a soft sponge. Your clay should be smooth, no grog or very fine grog. ..fine enough that burnishing won't scratch the surface. 

    Bisque to ^08 hold for an hour. If you over bisque terra sig, the smoke will not be absorbed. You might try smoking in a barrel or covered brick box. Use  sawdust, charcoal briquets, and wood. There a is great video by Piepenburg on this method. The photo is Apache red clay terra sig, with feather burned onto surface.


    Marcia Selsor.


    redfeather copy.jpg

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