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Found 15 results

  1. Cheers! I thank you very much if anyone can consult. I don't know why in the black or red ceramic paste (which I have high temperature), my faldespatico base enamels do not cover this clay. The enamels come out with bubbles.., although in white clay they work well for me. I understand that black clays contain ox iron and manganese..
  2. Notes: all test samples shown are blended at 73% clay, 12% C&C ball clay, and 15% mahavir potash as a baseline: fired in oxidation. Red body is a generic term used to describe iron bearing clays that have a red hue. There are other iron bearing clays that can present as green, grey, and black; these are exceptions, not the rule for commercial bodies. The three iron sources found in natural clay are hematite, magnetite, and iron disulfide. Iron disulfide is the common iron source in the USA and Canada; however hematite and magnetite are included because they are sourced in other countries. Hematite and magnetite are also harvested by local potters in North America. Typical iron bearing clays average between 5.0 to 8.4% of iron by weight. The tile graph below shows unglazed red bodied clays, with a locally sourced magnetite ( dark gray) sample from NY. (TY Mary) All five fire to a traditional Tera Cotta at cone 04; although there is some variance in color depth. At cone 3, enough heat is present to cause some reduction resulting in color shifts. At cone 6; iron disulfide typically turns a deep brown; magnetite is nearly black; while hematite maintains a Terra Cotta color pending alumina levels, or a deep reddish brown. The note below identifies the labels for each clay; as well as their iron source. Additional Test Note: IM (IMCO Burgundy), and RA (Red Art) contains iron disulfide as the primary iron source. Newman Red (N) is a blended material that incorporates primarily hematite. H (hematite) is a locally sourced material that is not commercially available. Magnetite (M) is also locally sourced and not available commercially. Nerd
  3. From the album: Clay Tests

    © TJA 2020

  4. glazenerd


    From the album: USB Images

    alkali film, iron oxidation

    © TJA 2018

  5. From the album: USB Images

    Hudson Rive Clay: alkali deposits, sedimentation lines.

    © TJA 2018

  6. Blending various blends of raw clay to set levels of titanium, iron, and calcium. The goal was to produce purple in oxidation: without the use of stains. A band of rutile was placed in the center, and Temmoku glazed over.

    © TJA 2017

  7. From the album: Ceramics Fall 2016

    I made 4 similar mugs from the recycled clay and iron filings in a glaze called moonlight. I have learned that a little goes a long way for the iron filings, and next time I think I will use less. Most of the filings came through on the inside of the cup, rusting slightly but covered thinly by glaze. Does any one else have experience with using too much iron filings? Do you feel it causes any safety hazards to the average human?
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