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Mart

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  1. Like
    Mart got a reaction from mousey in applying iron oxide to greenware   
    Red iron(III) oxide - Fe2O3
    Black iron(II) oxide - FeO
     
    At high temperatures, Fe2O3 starts to break down so O and F take off and you are left with the FeO
    In oxidation, this is how you get those cool "oil spots" happening on the glaze where Fe2O3 is converting and free O drags F to the surface and leaves it there.
    Someone can probably get you more detailed description of the process.
  2. Like
    Mart got a reaction from curt in applying iron oxide to greenware   
    Red iron(III) oxide - Fe2O3
    Black iron(II) oxide - FeO
     
    At high temperatures, Fe2O3 starts to break down so O and F take off and you are left with the FeO
    In oxidation, this is how you get those cool "oil spots" happening on the glaze where Fe2O3 is converting and free O drags F to the surface and leaves it there.
    Someone can probably get you more detailed description of the process.
  3. Like
    Mart got a reaction from annekat in Spoonrests or Top Ramen   
    Spoon rest must be a American thing. Really interesting that people buy those.
    Nobody here wants them even for free ( I made few to see do people like them)
    They ask: "Why use "spoon rests" if we have saucers that work as well"
  4. Like
    Mart got a reaction from Karen B in Knitting Bowls   
    Sorry for the off-topic but the secret is:

     

     
    After you selected the image, click Attach This File ... and then you need to click "Add to Post"
     




  5. Like
    Mart got a reaction from Babs in Tips Needed For Using A Press Mould   
    If it was sticking to your mould too, you be in real trouble.
     
    Before you waste too much time with this "clay", test fire a small piece of this stuff in a bowl. If it melts, it can not ruin your kiln shelves.
     
    BTW, someone's free crap can cost you your kiln.
     
    LOL, what if it's not terracotta at all but a red iron oxide rich glaze? If so, this will be one of those o_O moments. 
  6. Like
    Mart reacted to AnnaM in How Many Ways Can We Think Of To Put Text On Ceramics?   
    You can transfer images/writing really simply using strain powder transfers on leather hard clay. You need:
     
    *a clean ceramic tile, or more than one if you want to use more than one colour.
     
    *stain powder
     
    *paint brushes for mixing stain powder and water
     
    *pencil
     
    *paper
     
    On your clean tile mix stain powder and some water and spread it evenly as possible over the tile and let dry
     
    Once it's dry, take your piece of paper and pencil, lay it over the dry stain powder on the tile and write or draw what you want to transfer onto the clay or if you've printed out your artwork you can just trace the lines of your photocopy.
     
    If you want multiple colors, just have different tiles ready with different colours.
     
    Then just place the image/writing onto the leatherhard clay as you would a tissue transfer, but without adding extra water. And be careful when you're writing or drawing not to put too much pressure on the paper as the strain powder will stuck to the underside and then you'll get bits of extra colour on your work that you didn't intend to be there.
  7. Like
    Mart got a reaction from Norm Stuart in Firing Schedule, Cone 6 Glazes   
    Here is a spread sheet, that calculates different firing profiles for kilns/controllers sold in US
    http://www.bartinst.com/KILN/firingprofiles.xls‎
  8. Like
    Mart got a reaction from dofan in Cannot See Witness Cones   
    What is stopping you from setting your computer to go to cone 7? Or maybe even ~7.5 and see what happens? I have used cones only few times (anagama and my gas kiln) and you are right, they are not easy to see. Get yourself a pair of gas welding goggles as recommended before. If I recall, cones needed little bit space so there is nothing immediately behind them. Make sure you can see them well from the peep hole before you fire up the kiln. Too close to the peep hole will not help you to see them better.
  9. Like
    Mart reacted to Mark C. in Calculating Different Shrinkage Rates   
    Not sure whats up with all this talk-just forget inches switch to metric-its So much easier-I did this so many years ago it may have been the 70;s glaze/body calc class makes %s very easy
    Cut a pice from a pug about 3/8" thick 1 1/2" wide and about 6 inches long from whatever clay bodies you want to learn about
    Mark 10 MM with needle tool-thats two lines at 10 mm apart-keep this piece flat and bique fire it-measure agian and now its shruk whatever % from the 10MM write that on the bar in iron or colbalt then galze fire to whatever your are firing to and recocd this-write this on the bar along with the clay body type-Hopefully you put a hole it for hanging-now you have all the info needed to make another lide to bisque or glaze state.-Marcia spelled it out but I want it to be really claer and easy-metric turns it intoo a easy %.
    I use all measurement with metric rulers in clay its so much easier.
    When I make a lid i just use my wet finger to write underneath the lid the measurement in even metric #s so when that lady a few weeks ago broke her lid at an AZ show I asked her for the numder underneath she said 14 which means 14 mm wet-I threw anouther mailed it off after glaze fire fits perfect every time sight unseen.
    You need to know your bodys specs if you plan on working well with them.
    I'll get my formula off the wall in am and shot a few bar photos so you can see these simple things- I leaned all this from some fres Alfred grads fom the laste 60's they learned t from guys like Randal and Rhodes-some may have even heard of these guys but you will not find them on UTube.Better to look in the Library for thier books.
    This is all very basic and must be done early if you want to amke covered forms or whatever fit well.
    Mark
  10. Like
    Mart got a reaction from Norm Stuart in Need Advice, Too Many Options For Firing!   
    Screw this raku bs. Seriously. I do not understand why it has to be "raku kiln" and not a normal gas kiln, made of ceramic fiber blankets.
    I personally have no wish to waste gas on "raku" and produce this cheesy, fake looking "oh, it's so oriental" whatever. Sorry, but this "raku" obsession makes no sense to me at all
     
  11. Like
    Mart got a reaction from Rebekah Krieger in 12 Inch Club   
    Throwing stick? Are we carp fishing or pulling 12" tall beer mugs from mud?
    (yes, I know the stick you are talking about)
     
  12. Like
    Mart reacted to Benzine in Made In China: Takeshi Yasuda   
    Also, that Michael Jackson sculpture above, is really creeping me out...
  13. Like
    Mart reacted to DirtRoads in Poor Instruction And The Cost   
    "The woman is unstable, weird, and sometimes out right mean.   I will give the instructor credit for being very knowledgable but she is unpleasant and my friend is not getting what she paid for"
     
    "unstable" - Whatever.  A lot of the artists I know don't fit into a "normal and stable" mode.
    "weird" - Spent 10 years in academia and this describes most of the faculty.  Especially in Liberal Arts.
    "sometimes out right mean"  Some people are not used to anything but "oh how great you are".  Really need to decide if this is harsh criticism or meaness. 
    "unpleasant" -  Are they disrepectful or just have a curt way of expressing themselves.
     
    "will give the instructor credit for being very knowledgable" - So they do know their craft and the subject they are teaching.
     
    "my friend is not getting what she paid for" - Are they learning?  That's the key question.  You know some of the most brillant artists aren't that adept in people skills. This instructor sounds like they really do have a lot of knowledge to impart.  What exactly did your friend pay for?  To have fun? Or to learn?
     
    If your friend is learning, they should just "ignore" as previously recommended.  But it does sound like the instructor could be a little nicer
  14. Like
    Mart got a reaction from mregecko in Poor Instruction And The Cost   
    What stops you asking her to "dial down the crazy?" I bet you 2 get along a lot better after that.
  15. Like
    Mart reacted to Marcia Selsor in Cone 5/6 celedon glaze   
    Selsor Faux Celedon ^6 Oxidation
     
    Whiting 18.5
    Neph Syen 25.8
    EPK 18.8
    Silica 31.1
    Gerstley B 4.6
    98.8
    Copper carb 0.3
    Mason #6600 Black 0.02
     
    Gayle's Celedon from Clayart ^6 Oxidation
     
    F-4 or Minspar 50
    Wollastonite 20
    Kaolin 10
    Silica 10
    Gerstley Bor. 10
    100
    Copper carb 0.3
    Mason 6600 Black 0.05
  16. Like
    Mart reacted to phill in Gallery Commentary?   
    I stand corrected John. I agree with this. However, I still believe that even if it is an opinion it can still be helpful. Some of the examples you gave could be labeled opinions as well.
     
    Perhaps instead of good and bad, I should use right and wrong. 
     
    In today's culture, no one can be right anymore or you get in trouble. There are no rights and wrongs it seems, only grey areas where everybody wins. This...is scary to me. How do we know where we came from, and how can we figure out where we are going? 
     
    If you were to have two mugs side by side in comparison, and said, this handle is good, and this handle is bad. That would give direction. That would give an idea to the maker that the visual characteristics on the good handle mug are worth studying and even improving upon. Good and bad are okay terms to use I think.
     
    I think you are wrong when you group "i like" and "I don't like" with "good" and "bad." These are totally different things. Our good and bad ideas of pottery have been shaped by tradition, famous people, smart people, wrong people, and right people, and lots of people, groups of people, and practice and time. This is true for many things, like what is appropriate and inappropriate behavior for people in public. Just like there are good and bad pots, or well made and poorly made if you'd rather, our ideas of almost everything have come from history, other people. And all these things tend to have a right and wrong category, a good and bad category. 
     
    I agree with your critiquing examples, they are helpful, but I disagree that telling someone that their handles are bad is a no-no. I can see how ONLY telling them their handles are bad probably won't give them any help. This would constitute following up with a "because..." 
     
    I also agree that critiquing work tends to work well between two that have a solid and trusting relationship. But if Warren Mackenzie were to come up to me and tell me I make bad handles, you bet I would listen to him. Same goes for any other potter who has "made it." And what's funny is that I trust them solely because the general public has accepted their work as GOOD. 
  17. Like
    Mart got a reaction from Patsu in Errors Uploading Images To Gallery   
    Usability of this galley is so bad that I can not even find words to describe it.
     
    Seriously annoying "features" :
    1) Uploading images one by one - seriously? Are we still in 1999?
    2) Sorting/grouping images - this is a joke! Allow dragging of images to any order gallery owner likes.
    3) Gallery owner can not add comments without admin approval - LOL! Why? Spam?
    4) If you click on the to view it (magnifying glass thingy), it opens up a new image but there is no way to move to next image. I have to start over.
     
    Important features
    5) resize (single or batch) - most people have no idea how to resize their huge images. This is a must feature and is really easy to implement (There are fee and open source libraries available for every platform out there Java, PHP, .vomit-Net etc)
    6) multiple file upload - seriously
     
    I have no idea why you guys have wasted time and money reinventing a wheel. Use open source image gallery software that can be integrated to your forum software. Oops, you guys are on IP board.. OK, never mind. Good luck.
  18. Like
    Mart got a reaction from Patsu in Cones And Soaking Times Theory   
    yawn... this is one of those "I told you so" (about cones and how outdated/limited this concept actually is)...
    Lets use rings, forget the cones! LOL
  19. Like
    Mart got a reaction from Patsu in Dipped Glaze Producing Air Bubbles   
    As I understand it, this is before firing.
     
  20. Like
    Mart reacted to Rebekah Krieger in Uneven Glaze..   
    Here is another non commercial glaze I had mixed at Glaze mixer. This one is a Matte.  It shows how uneven it is because the clay body is dark.  I have watched videos on applying glaze but they all seem to dip and have a beautiful Medium layer. 


  21. Like
    Mart got a reaction from Patsu in Knitting Bowls   
    Sorry for the off-topic but the secret is:

     

     
    After you selected the image, click Attach This File ... and then you need to click "Add to Post"
     




  22. Like
    Mart got a reaction from Patsu in Knitting Bowls   
    Here is a 20 cm (~8") knitting bowl I made not too long ago http://www.oostuudio.ee/vaagen-kudujale/
    You can see the slight warping on second picture. I was told it has no negative effect at all, while in use.
    So, why worry about it?
  23. Like
    Mart got a reaction from Chris Campbell in New Regs On Silica Dust   
    Frederik-W +1!
     
    Dear Americans, all you need to be paranoid about are:
    1) your government (including 3 letter agencies)
    2) bankers
    3) GMO
    4) and not getting gypsum into your clay.
     
    Common sense will take care of the rest.
  24. Like
    Mart got a reaction from OffCenter in New Regs On Silica Dust   
    Frederik-W +1!
     
    Dear Americans, all you need to be paranoid about are:
    1) your government (including 3 letter agencies)
    2) bankers
    3) GMO
    4) and not getting gypsum into your clay.
     
    Common sense will take care of the rest.
  25. Like
    Mart got a reaction from Idaho Potter in Beginner Needs Suitable Clay For Bonsai Pots   
    I made one out of white stoneware clay and used iron oxide (F203) to darken the surface. It has wire and water/air holes at the bottom too. 26,5 cm wide.

     
    Use clay in same temperature range you usually fire.
    Have fun
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