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JMWP

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Posts posted by JMWP

  1. @Callie Beller Diesel I am using Georgie's Trail Mix clay. I have no idea of it's contents but description says plastic and forgiving with sand for strength. Midrange stoneware, off-white after firing.

    I recall reading about the particle size of stains being larger and heavier, would using oxides make a difference? If so, what would yield a good black or dark brown?

    As a result of my testing additional colors, I found that the peacock and hazelnut brown did very well after firing using my clay body! The colors stayed bright and sheen remained. The black  and deep brown went gray as usual, even with the OM4 clay terra sig.  I did notice various shades of black mason stains so I'll try the one that is called onyx (Co,Cr, Fe, Ni) , which looks very black. I'm using best black (Cr, Fe, Co, Ni), which I find interesting because they both have the same chemical compounds but in different order. Wish I could remember my chemistry days so I can understand why it makes a different shade of black!

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  2. I am using a plastic bag and polishing and sometimes with a soft  microfiber cloth. I've tried a metal spoon and a smooth rock but those seemed to leave marks, which might be because I'm not burnishing properly.  Any other suggestions that I might try?

    Today, I tried a bright peacock blue mason stain and a chestnut brown with both the clay body I normally use and a ball clay.  I  got better results with the brighter colors with both terra sig mixes, more like I expected with a satiny sheen when dry with the color still bright. But the black and deep brown both  also turned  shades of gray in varying degrees with the ball clay sig. Maybe it's the dark colors? I wonder how potters get the beautiful black? 

    Just curious if anyone might have a picture of a pot with black terra sig on it , but dry, before bisque firing so I can compare to mine? I'm new at this so I have no idea what is normal and what is not.  Maybe black does turn a little gray when it dries?  Or not . . . . :)

  3. Today I tested a black mason stain with the same clay terra sig 2 ways: one on the same textured sample and another on a greenware, smooth vessel. Both polished up nicely but the textured sample hazed a bit, though not as much as the deep brown. Still waiting on the vessel but I can see a some of it turning where it is drying. I put on as many layers as I needed to not see any of the clay underneath but unfortunately there's a hairline crack in the sig where I assume it maybe dried too quickly with as many layers as I put on (too many too quickly?).  

    I did try a plain one without stain and at first I thought it was going to be fine but the next day it looked slightly duller. I took a soft cloth and polished it some more which added back a little more shine. I'm firing it tonight to see what happens.

    That's an interesting thought about adding wash then the terra sig over it. I will give that a try!

    I have to admit, I've only seen this process done on videos so I don't know what is normal when it has dried. I assume hazing is not normal?  Is it supposed to remains as shiny as when you're done polishing like attached image where  I've just finished polishing or does it get slightly duller when completely dried? Most images of terra sig pots have a lovely sheen! If I wax it, there is a lovely sheen, but I'm assuming with terra sig, you shouldn't have to unless you fire it too high. Thanks for all your relies. I will try ball clay next and see what happens.

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  4. Thanks Neil for your feedback. Much appreciated! I've also covered a  small, smooth bowl with the deep brown terra sig with 4+ layers and polished it. Same outcome, where it is beautiful and rich until it starts drying. Then turns hazy and gray. I've also tried different ratios of the stain to terra sig  with same haziness so I guess it must be the stain or maybe the clay I am using.  It's almost like the thin slip is drying over the stain color., if that makes any sense. I will try out different colors, maybe with ball clay, and test them out to see if I can get beautiful results. 

  5. Hello there!

    I very much like terra sigillata and have started to make small batches of my own, using the same clay body that's dried and crushed, water, and sodium silicate as the deflocculant. I let it separate, decant the top layer of water and ladle out the sig. I am adding a mason stain (deep brown) after the preparations. I have applied the colored sig to a piece of greenware (a bowl) and a textured bisqued sample. I apply as many coats as needed to get an adequate layer and then polish with a plastic bag and buff some more with a soft cloth. When finished, it's the most beautiful color and sheen I've ever seen! But then as it dries, the color starts to turn hazy and grey. The polish is still there but the color is dull.  I've attached an image of the sample where the edges are starting to dry and turn grey. The center where it's still moist shows how I assumed terra sig should look when dry? As a side note, I am using terra sig in a slightly different manner on the textured sample, kind of like a wash to get variation in color/depth. I really like how the higher areas get polished and the lower areas less so. 

    From all the images I have seen with terra sig, all the finishes with color look buttery and bright.  Just curious if this is normal for this color of mason stain or if maybe I'm not doing something correctly along the process. I have added wax to one of the pieces after fired to cone 06 and the wax brought back more of the the color. Also, I tried a sample with plain sig (no added stains) and it's stayed a nice soft sheen. Is there any way to eliminate the haziness? I've tried polishing more as the haze sets in but makes very little difference. Any  suggestions on what I can try or comments would be greatly helpful!  Thank you :)

     

     

     

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