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marcello

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About marcello

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    Pesaro, Italy
  1. Hello Marcia, can you please give some details about the firing? I am ready to test the panama red glaze, but it would be helpful to know if it was a strong or light reduction firing, when you started the reduction, for how long, and so on. Many thanks Marcello
  2. It would be interesting to read your 10 page paper Thanks Marcello
  3. thank you, a lot of informations for my tests! About the clay, what is your opinion on how to get a yellow clay after a reduction firing? I get this color only in oxidation, and i get a dark brown in reduction.... thanks Marcello
  4. Thank you Marcia! can I please see also the foot of your nice work? Any additional info about the firing schedule would help. I will certainly try, even if I fire at cone 10. Certainly with a lower temperature the iron bearing clay should come out lighter. I have tested some britt's oxblood at cone 10- Some of them are really good (I am posting an example) but they come colorless where copper hasn't turned red. I am thinking also what would happen adding a little iron in the glaze, How knows if it would effect the reduction? If copper burns away, maybe a little iron would keep the glaze green. It would be a celadon maybe?
  5. in my tests using a iron bearing clay does not produce a green... but a black. the clay also becomes much darker.... Maybe the reduction should be lighter?
  6. Hello, I am testing some oxblood glazes on tea bowls. I am trying to have the red where the bowls are reduced and green where they are oxidized, just like the one i am posting here. In my versions, the areas are not reduced are always transparent/colourless. Do you think it is a problem of chemistry or a firing problem? Looking at the color clay of this bowl, It seems it is fired with a light reduction. Do you agree? If I use an iron-bearing clay, it comes much darker after reduction. many thanks Marcello
  7. Hello I would like to make a stoneware similar to the one i am attaching here as a picture. Can anyone give me some advise? I guess the black spots can be obtained by adding... maybe pyrite? Does anyone have some experience in making similar clays? Or can advise a book to study? Many thanks Marcello
  8. Yes but the result was not satifing... I think I will try weighting the glaze. Do you think I can use an airbrush to paint the cup, instead of using my paint gun? I havent' tryied brushing it.... I will make a test. Thanks Marcello
  9. Hello, I am testing an rabo glaze that requires a very thin layer of glaze. Il the layer is just a little thicker the glaze changes its aspect. I have some problem: -if i dip a cup in the glaze (even if its density is low) there are many areas in which the layer is thicker and the result is not good -if i spray the glaze on the cup it is very difficult to tell the correct thickness, because it has to be thin... The result is random... What can I do? I thought maybe I can weight the glaze to tell how much I should spray, but all cups are in different sizes, it seems very difficult to tell.... Thank you for your advises. Marcello
  10. One thing it is not clear in the book is if the slow cooling effects the number of the yellow crystals or their size. In my case the glaze as you can see is full of crystals, but they are very small. In the book the picture of Coleman tea dust (provided by the author of the glaze) looks promising but it is not one of the tea dust Britt tested. None of the tea dust tested by Britt seem to have large crystals.... However I will soon try his reduction R3 firing cycle to see how the glaze will change. Thanks
  11. Thank you. I have his book, and the glaze I am testing is actually the "Coleman tea dust"....
  12. I will soon try. I have a propane kiln. Thank you Marcello
  13. Thanks for your reply I am attaching a link to a file to explain the situation. On the right: the glaze I made. It is covered by very small yellow dots. I would like them to be larger, like the bowl on the left.... The bowl on the left comes from Japan. Looking at the color of the clay, I would not say it was fired in reduction. Do you think the cooling cycle can make the difference? Thank you again Marcello https://drive.google.com/file/d/0B1wg1x2St-AhX2J0Rno3R3VBM3c/view?usp=sharing
  14. I would like to attach an image to explain. How can I do? It seems like it is not possible....
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