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Posts posted by Tabathos

  1. Hello. I did a test tile with some materials I don't know their name. They came as a bonus with my old kiln, so I did a test tile in cone 2. 

    I would be grateful on insights about this. I know one is a feldspar (because the box says so), but it doesn't specify what kind of feldspar it is. I also wrote how the material look in raw state. Thank you very much in advance. 

    Edit: The one that says yellow crystal actually dissappeared. I wonder if it volatized, or fell off the tile.

    test tile.jpg

  2. Just out of curiosity, how do I recognize lead in a particular scenario?

    I bought a lot of old stuff from a potter with my kiln, and while I think it is highly unlikely she used lead, I would like to know what it looks like.  Actually, there are some materials I don't know what they are, so I'm not using them.

    PS: The lady is dead. And her nephew (the guy who sold me the stuff) doesn't know much about it. 

  3. Has anyone ever heard of this brand of old glazes? The box says "Reward Ceramic Color", and the products name is "Kristalific", or something like that (the picture is blurry, so I'm not sure)

    Someone is selling me a lot of sealed boxes of this glaze at a bargain price (inherited by his deceased aunt), but I can't find anything on the web about it. The manufacturer seemed to be based in Maryland. 

    Thanks in advance. 

  4. 4 minutes ago, oldlady said:

    welcome to the forums, tabathos.   what country?  does your clay have a cone number that it is fired to?  is it terracotta clay"?   there are many other bits of information that would help someone who is familiar with your problem make a good suggestion.  what suppliers are available to you?

    (Kaolin is a type of clay.)

    Thank you very much. I'm from Costa Rica. It is fired on cone 04. I'm not sure if it is terracotta, there's attached a picture of a bisque as reference. 

    Regarding suppliers, I know that this red clay is widely available. The white one we use is imported from Mexico, but I've tried it and it's like using polymeric clay.

    I'm thinking on mixing kaolin with the red clay, but I'm unsure if it is safe to use. 


  5. 6 minutes ago, liambesaw said:

    Try using a white slip, fishsauce slip is a good recipe for many bodies, add some zircopax to really kick up the whiteness.

    Found this recipe: 

    Fish Sauce ^04-^10
    Minspar 23.50
    Grolleg Kaolin 43.60
    Pyrophyllite 7.80
    Bentonite 9.50 (or substitute 6.3 macaloid if your bentonite has specks)
    Silica 15.60

    What proportion of zircopax do you propose?

  6. Hi. I'm relatively new on ceramics. Currently doing pieces using red clay. The problem I have is trying to achieve a uniform glaze colour. Since the red clay is the base, it passes through the color of the commercial glazes (I'm using Duncan cone 06). My teacher told me to add a caolin layer before applying the glaze,  but the results are far from satisfactory. Some parts exploded, other parts have a depressing yellowish tone, really dreary to see. 

    You may think that why not using white clay. It is kinda expensive and it's not as moldable as the red one. Also it is difficult to find in my country. The red is perfect except for this issue.  I've emailed the manufacturer, and they told me to use white bisque (hahaha), or to use opaque glaze. It would be nice if I haven't spent a lot of money on semi-transparent glazes and some underglazes -_-

    Any recommended input? I've been told to layer caolin over the greenware before bisque, or to use a white engobe over the greenware, but I'm not sure what to do.  

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