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Amaco Ancient Jasper Question


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#21 vks84

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Posted 07 December 2010 - 12:42 AM

I received a sample of this glaze from a handbuilding workshop I went to in Atlanta. I made a test tile for the glaze and absolutely loved it. I dip my test tiles 3 times at different levels so I can see how the glaze works when applied differently and they also have a break in the tile to see breaks in the glaze. I bought a pint of the glaze to put on a platter I had made. First time I fired it, I got an almost black color and really gritty. I figured out that I had definitely not applied it thick enough. Applied more glaze super thick and fired again. This time I got the same dark color but with streaks of red in the glaze. Not what I was hoping for even though I do like the effect. In my test tile I had a beautiful green with tints of tan and red in it. Guess I will have to do more testing. Will try to post pictures after Wednesday when I go back to school.

#22 Pam S

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Posted 08 December 2010 - 09:27 PM

I have a plethora of test pinch pots to go in for a glaze fire. Just haven't had the time to fire, hopefully this weekend. Once again I'm trying the Ancient Jasper. It was put on a small leaf shaped plate with some texture and applied thick. Thanks for the warning about running!!! We'll see... Trying some new commercial glazes, AMMACO, Palladium and Coyote, Opal and Archie's Base. I'm also playing with a couple of home made glazes that I didn't like by adding a few ingredients. Sometimes this feels like I should be chanting, shaking chicken bones and bringing out the magic wand when I fire up the kiln.

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#23 buckbuck

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Posted 24 December 2010 - 01:50 PM

Thank you all for the detailed responses. I did a smooth porcelin vase with 3 brushed on coats. Got mostly dark with some red higlights, still good just not the red I was looking for. I will definetely try it on some texture and thicker coats.

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#24 cracked pot

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Posted 15 February 2011 - 10:32 AM

Just out of the kiln, ancient jasper over firebrick red on red rock clay. Love the colors. Sorry the pic come out so big. Have not figured out how to upload thumbnail size.
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#25 JLowes

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Posted 20 April 2011 - 09:29 AM

You are all very welcome. I don't like anyone to struggle with one of my creations. I am also glad you all like the look of ANCIENT JASPER.

Steve...........



Steve,

Once you have fired too thin, will adding glaze and refiring be an option to revitalize the Ancient Jasper, or should one just move on from that pot? I have a couple of the "eggplant" colored variations.

John Lowes
Sandy Springs, GA

#26 Steve Lampron

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Posted 02 May 2011 - 06:35 AM


You are all very welcome. I don't like anyone to struggle with one of my creations. I am also glad you all like the look of ANCIENT JASPER.

Steve...........



Steve,

Once you have fired too thin, will adding glaze and refiring be an option to revitalize the Ancient Jasper, or should one just move on from that pot? I have a couple of the "eggplant" colored variations.

John Lowes
Sandy Springs, GA



#27 Steve Lampron

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Posted 02 May 2011 - 06:40 AM

John,


I have not had great luck adding more glaze to a thin glaze piece but I would also never tell anyone not to try. As a general rule I would say start over with a new pot. If you decide to try adding more a good suggestion is to warm the pot so the glaze will be applied and stay where you put it. I put pots into a cold oven and heat it until the pot is 200 F. You need to soak it there until the pot becomes warm all the way through. 15-20 minutes should do it. Let me know how it turns out.

Steve...

#28 Lyptus

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Posted 03 September 2011 - 09:38 AM

Nice

#29 nlynn

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Posted 06 September 2011 - 09:09 PM

I have tried several of the Potter's Choice glazes and I have had very little success. Not one with the exception of Temmoku has turned out as they are marketed. They basically look like mud. Temmoku is the most consistant, but even then has variations.

I have noticed that the glazes look best on textured areas, and straight walls. However, I would like to see the same effect across the entire piece, not mud and beauty.

I feel a little decieved in that, if I am to apply thick coats, certain firing scheduled and clay bodies that I should be told by Ammaco.

I fired Blue Midnight yesterday on a white clay body and only the straight walls had any texture or movement in the glaze. The rest was almost black.

I also tried Deep Fire Brick Red under Ancient Jasper on the inside of a bowl and only Ancient Jasper on the outside. The outside turned out almost black, but the inside is absolutely beautiful.

And yes, even on the outside there was some movement with the texture, but how much texture in a piece do you have to have?

Albany Slip isn't much better. I tried it on several clay bodies and I got no breaking except at the handle point on a coffee cup.

I will pursue the Fire Brick Red under Ancient Jasper again with a 6 hour fire as suggested above.

This combination as in the pictures above is beautiful.

But Ancient Jasper alone and many of the other Potter's Choice glazes mostly turn to mud. That's my experience.

nlynn

#30 nlynn

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Posted 06 September 2011 - 09:26 PM

This is a terrible picture and certainly does not do the glaze justice, but I wanted to show you Deep Fire Brick Red under Ancient Jasper.

I used a white clay body, bisque fired to 04. Inside the bowl I put one coat of Deep Fire Brick Red and then with a fan brush added 2 more coats of Fire Brick in areas around the sides and on the bottom. Then I put two coats of Ancient Jasper and fired to cone 6.

There is some red, but I think it is from the Deep Fire Brick Red and not the Jasper. The Jasper did break and move with texture. I really like it.

nlynn

Okay, I thought I put a picture up, but I guess I don't know how. I'll try again.

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#31 Marc McMillan

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Posted 07 September 2011 - 09:30 AM

Nlynn,
While I have had issues with Ancient Jasper (but will keep trying), I have had great luck with many of the Potters Choice glazes. Especially the Albany Slip Brown. I found the link below that might help diagnose the issue you are having - if it is a glaze thickness issue. They have test tiles with different thicknesses. The 'mud' ones tended to be too thin.
Anyway, good luck.
Marc


http://www.amaco.com...#pc-application

#32 nlynn

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Posted 07 September 2011 - 11:04 AM

Marc,

Yes I have seen that page and I am very interested. I understand that thick applications get the effects of the glaze. However, my reluctance comes from the prevention of running and sticking to the kiln shelf.

I do the type of glazing where less is best and I do this quite well with Coyote glazes and adding shino's on the top of the piece for variations.

I plan on my next fire to really slop on the Potter's Choice glazes.

However, can you advise me as to how high I should make my foot?

Do heavy coats tend to run or is it stable?

Also, when you say thin, do you mean the thickness of the glaze itself, number of coats or the thickness of each coat?

Thanks,

nancy

#33 Marc McMillan

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Posted 07 September 2011 - 11:58 AM

Nancy,
I understand your reluctance as my past kiln firing had me thanking the kiln gods for a thick coating of kiln wash.
I was actually using Coyote Glazes during that firing. I love the Ice blue but like it thick for different effects. In these cases I use a pedestal and catcher just to be safe.

I don't think I can tell you what is thick enough. Perhaps do some test tiles first so you can see what happens at different thickeness under your specific firing program.
You could even put them on a catch plate to be 100% safe.

I can tell you I have had great luck with the stability of the Potters choice glazes. If I were to compare thicknesses, I would say I am more confident about the stability of them than the Coyote glazes, which I love by the way.

Good luck!
Marc

#34 nlynn

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Posted 07 September 2011 - 01:31 PM

Nancy,
I understand your reluctance as my past kiln firing had me thanking the kiln gods for a thick coating of kiln wash.
I was actually using Coyote Glazes during that firing. I love the Ice blue but like it thick for different effects. In these cases I use a pedestal and catcher just to be safe.

I don't think I can tell you what is thick enough. Perhaps do some test tiles first so you can see what happens at different thickeness under your specific firing program.
You could even put them on a catch plate to be 100% safe.

I can tell you I have had great luck with the stability of the Potters choice glazes. If I were to compare thicknesses, I would say I am more confident about the stability of them than the Coyote glazes, which I love by the way.

Good luck!
Marc


Yes I do notice that the Potter's Choice never creeped beyond the bottom wax line, eventhough I glazed with thinner coats. It seems to be as stable as Versa, but I'm not ready to have that much confidence.

I will practice on tiles and also use a catch plate. I can't wait to get the Albany Slip effect on a piece. I love that glaze.

I did read on another forum that when he used Ancient Jasper in thin coats, it turned black and ran all over the place. He too learned the hard way that it takes thick coats and applied quickly.

I am not jumping for joy over my bowl above, as the outside is mud, but the inside is absolutely beautiful.

Thanks Marc, Nancy

#35 cracked pot

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Posted 08 September 2011 - 01:01 PM


Nancy,
I understand your reluctance as my past kiln firing had me thanking the kiln gods for a thick coating of kiln wash.
I was actually using Coyote Glazes during that firing. I love the Ice blue but like it thick for different effects. In these cases I use a pedestal and catcher just to be safe.

I don't think I can tell you what is thick enough. Perhaps do some test tiles first so you can see what happens at different thickeness under your specific firing program.
You could even put them on a catch plate to be 100% safe.

I can tell you I have had great luck with the stability of the Potters choice glazes. If I were to compare thicknesses, I would say I am more confident about the stability of them than the Coyote glazes, which I love by the way.

Good luck!
Marc


Yes I do notice that the Potter's Choice never creeped beyond the bottom wax line, eventhough I glazed with thinner coats. It seems to be as stable as Versa, but I'm not ready to have that much confidence.

I will practice on tiles and also use a catch plate. I can't wait to get the Albany Slip effect on a piece. I love that glaze.

I did read on another forum that when he used Ancient Jasper in thin coats, it turned black and ran all over the place. He too learned the hard way that it takes thick coats and applied quickly.

I am not jumping for joy over my bowl above, as the outside is mud, but the inside is absolutely beautiful.

Thanks Marc, Nancy


I would agree with Marc about the stability of Amaco glazes. I also like Coyote glazes but would never apply them as thick as I do Amaco PC glazes. I apply three thick coats of PC glazes, letting them dry in between layers. For A. Jasper, I then apply another coat on the rim. Also, when firing A. Jasper, I put it on the bottom kiln shelf, in the middle, surrounded by taller pieces.

#36 Masha7

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Posted 05 November 2011 - 01:37 PM

I've used this on dark buff stoneware with 3 thick irregular coats applied with a hog bristle brush, inner surfaces only. Wow! It really pops, the reds are incredible. With a thinner coating, it's a dark espresso with red, ochre and blue in the textured areas. Once I got used to it, I learned to love it. But I never use it on exteriors, it flows sometimes....

#37 Pam S

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Posted 06 November 2011 - 01:16 AM

Even with the advise of the makers, I've given up on Ancient Jasper. It's never come out like the photos on the web site. Not even close. I've tried different firing schedules, different clay bodies and it always turns out black to dark brown with little bits of red and eggplant. Guess I'm not holding my mouth right...

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#38 Benhim

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Posted 06 November 2011 - 02:49 AM

It's amazing how many companies don't respond. I've contacted about a dozen companies in the last three months that didn't respond. In each case I was prepared to purchase materials from them and said so in the email. No wonder our economy is down, no body is doing their job.


... It would be nice if all the suppliers actually tried to help point us in the right direction every once in a while.


Yes, it would... but in my experience they don't reply to questions emailed to them directly, so I wouldn't hold my breath that they will post here. I wouldn't treat my customers that way, but I guess that's pretty old-school these days.;)


BenCo Ceramics


#39 ~janie

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Posted 28 November 2011 - 09:50 PM

I have a whole shelf of pots glazed with Ancient Jasper, waiting to be fired. Now I am wondering if it is not enough, too much or just right.....

A friend glazed big plates with AJ, and it ran, to the point of ruining shelves. I am afraid that I may not have enough on my pots. I think I will add a bit more...

A very instructive thread. I am very appreciative of Steve Lampron.

#40 klen11

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Posted 04 December 2011 - 12:05 AM

I wonder if maybe firing at too high of a temperature is causing the browning. It's simply a guess. Another thing could be the ceramic bisque you are using. Some ceramic bisque is made with too much silicate and ends up changing the paints natural color.
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