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Marcia Selsor

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Posts posted by Marcia Selsor

  1. On 3/20/2018 at 11:15 AM, Arnold Howard said:

    I have Thermal Ceramics brand K23 and K25 bricks in front of me. They look the same. New bricks are stamped with the temperature rating on the end. There is a slight difference in weight:

    K23, 2.5" thick: 1 lb., 15 oz.

    K25, 2.5" thick: 2 lb., 7 oz.

    I recommend "21st Century Kilns." It is available on Amazon.




    Arnold Howard

    Paragon Industries, L.P., Mesquite, Texas USAahoward@paragonweb.com / www.paragonweb.com


    My top hat raku kiln is in that book! Lots of great info in that book. Mel compiled some excellent info.


  2. BIG Question:

    Is there a kind of mysticism around Terra sigillata? Extra-precise not necessary chemistry?

    I think it depends on how you plan to use it, to find which way works best. The boiled terra sig above is leaving visible brush strokes on my work when I am focusing on surface patterns from the saggar firing. The fast terra sig that I learned in Italy, does not do that. Both are made with the same clay. My fast terra sig is thinner than the boiled type at 1.15 SG. I have been making Terra sig for several decades using various methods including ball milling for 24 hours. The fast terra sig works for how I use it.

    Does this answer your question? 


  3. 55 minutes ago, oldlady said:

    :Pmarcia, do not tell your age like that!!!!

    My friend, Rosana Antonella just had an article about her terra sig work in PMI written by my other friend Claudia who manages the school program at La Meridiana. Rosana is from Rome...hence Roman!



  4. 2 hours ago, Yvanox said:

    Wow, tks Marcia you are so generous!

    We finally come to the big question ... I have consult a lot of videos and recipes on the web and I am still confused! How come some arrive at very good results without too much precision and with little waiting times while others have a precise technique worthy of a laboratory with times that goes as far as 72 hours with specific gravity mesures?

    Is there a kind of mysticism around Terra sigillata? Extra-precise not necessary chemistry?

    Tks again folks for your generosity!

    Terra Sig was from the Greeks and Romans. I learned from the Romans.

    except for the plastic bottle.


  5. yes. add water. then you may have to adjust again..then boil it. it goes back and forth. The quick terra sig that I learned in Italy, does not rely on SG. This video 3 below is from my dvd. The bottle in the video is .591 ml and I added 125 grams.  The edited script says 750ml.  Its easier to use a liter bottle and 200 grams. see the recipe here. https://www.marciaselsorstudio.com/how-to-make-terra-sigillatta.html  Here is more detail. http://www.lameridiana.fi.it/pottery_clay_papers.htm  There are many ways to make and use terra sig. This is a good one immediately below for earthenware , but it is not good for my use in saggar firing. 




  6. On 3/15/2018 at 8:13 AM, Stephen said:

    agree with Mark. I think pottery as an art medium is without question true, too many examples to deny BUT it also is a a craft that has been used for centuries to make items to be used as functional ware. That's were my passion lies and I consider myself an aspiring artisan craftsperson. I love the back story to that and its history going back centuries and proud of the meager accomplishments I've made in that regard. Feel no need to be recognized as an artist as that is not something I am pursuing with my work. Decorative functional items such as vases and such are a fun outlet I want to pursue more of in the future but I think its a slight to those who are seriously pursing pottery and ceramics as artist for me to claim a distinction in my work that is simply not there.  

    Have you considered if stone carving is an art or functional? Stone carvers build houses , bridges, yet Michelangelo carved David. ceramics is a material that is spark plugs, space shuttle tiles, knives, pottery or sculpture. The final product is what it is.



  7. You did a great job, Spring. I enjoyed your personal journey and  all the things you realized you learned from it. Nice to meet you in person. I remember your piece in a show in Portland (?) .

    lots of leaves.  

    NCECA was great. Hung out with old friends including Pres.. Very mellow. Got to 4 actual events, lots of show, and the ICan reception. Our hotel have breakfast and dinner included which saved a lot of money. Even included a free glass of wine plus $.75 for the 2nd and 3rd. Not bad. Plus lots of space for hanging out and visiting with friends. Many of the hotels don't have that. Really enjoyed it this year. I have missed three NCECAs since 1971. greeley , Co was the smallest with about 500 in 1976. (dry county but someone brought a few cases of beer to the campus).




  8. I had a Cress (used) about 45 years ago. I agree with dhpotter, just a simple, 2 hours on low, (with lid cracked open til steam stops..check with a mirror or mason jar, by watching if they fog up) shut the lid after 2 hours or if you still have steam, shut after the first hour n medium,.

    2 hours on medium turn to high until finish. Check after 8 hours after beginning.



  9. I used a similar system for color development. I learned it in the 60s and used it when I ws teaching. I posted it here several times over the years but not lately. I mix 250 gr. of the base. Add water to a glaze consistency. Pour equal amounts into 5 cups ( 50 grams of dry mix in the batch)  labeled A,B,C,D,E.. . have a 6th cup for the mixing. Have 15 tiles prepared, bisued and numbers 1-15. Add a good variety  of colorants. Example: A=base add a colorant to the base if you like.  B-3% iron Ox. , C=2% copper carbonate, D=1% cobalt carbonate, E. 5%rutile  The weights are 1/2 of the % amount since it is a 50 gram batch in each cup.. Ex.  1.5 grams for 3%  for the iron.  Mix in and sieve.

    1st row is straight from the cups   A, B,C,D,E 

    2nd row    Mix a teaspoon of A with each of the others    A+B, A+c, A+D, A+ E   this reduces the colorants by half 

    3 row   Mix B+C, B+ D, B+ E  this reduces the colorants by half 

    4th row  C+ D, C+ E  this reduces the colorants by half 

    5th row  D+ E   this reduces the colorants by half 

    this gives 15 color variations relatively quickly. and only one dry mix.



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