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Searching For Discontinued Glaze - Help? Also Lead Questions

glaze lead discontinued jungle gems mayco

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#1 ashleigh_arts

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Posted 20 February 2014 - 01:17 PM

Hello everyone! I'm new here, and I've been reading some threads. I was wondering if anyone might know of anyone or might have stashed somewhere, the Blue Marble glaze from Mayco Jungle Gems. This glaze was discontinued in the early 2000s because of its lead content. I just recently discovered it when someone had a tiny amount for me to glaze a pinch pot. I glazed it at cone 6 instead of 06 (oops) but it came out AMAZING! (Turns out Jungle Gems CAN be fired at cone 6!). The Mayco rep contacted me about my inquiry and is sending me a package of glazes to play around with to see if I can recreate it, but I would really like to find something very similar or some that someone isn't using. I will pay a reasonable amount for this! :)

 

Questions:

 

Is touching a piece made with lead glaze harmful?

Once a lead glaze is fired is it still dangerous?

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#2 neilestrick

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Posted 20 February 2014 - 01:53 PM

There are two types of safety labels on glazes. First, the toxicity label (non-toxic, toxic, etc). This usually features the code ASTM D-4236, which is the code by which art materials must be labeled for health hazards. The toxicity label only applies to the form in which you purchased the glaze. If you purchase a wet mixed glaze, then the label only applies to the wet mix. Once it's dry on the pot, the label no longer applies. This is important to know because dry glazes will never be labeled as non-toxic because silica, and many of the other ingredients in our glazes, are known carcinogens. You do not want to breathe clay or glaze dust for this reason.

 

If a glaze is labeled as toxic, that doesn't mean you shouldn't use it. The toxic rating may be due to the level of copper or cobalt, both of which can be handled safely with common sense. Just use good hygiene practices when working with glazes. Don't sweep. Instead, mop or sponge clean to keep the dust to a minimum. Don't eat or drink when handling glazes. Wash your hands when you're done. Again, use common sense. Read the label and follow directions. Toxic glazes should not be used by children under a certain age, and the label should tell you this.

 

The second safety label will tell whether or not the glaze is safe to use on surfaces which come into contact with food. A toxic glaze can be food safe. A non-toxic glaze can be non-food safe. They have nothing to do with each other. A glaze with lead in it can be food safe. You'll have to read the label. Make sure you fire at the temperature that is recommended by the manufacturer. A glaze that is said to be food safe at cone 06 may not be at cone 6.


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#3 ashleigh_arts

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Posted 20 February 2014 - 02:05 PM

There are two types of safety labels on glazes. First, the toxicity label (non-toxic, toxic, etc). This usually features the code ASTM D-4236, which is the code by which art materials must be labeled for health hazards. The toxicity label only applies to the form in which you purchased the glaze. If you purchase a wet mixed glaze, then the label only applies to the wet mix. Once it's dry on the pot, the label no longer applies. This is important to know because dry glazes will never be labeled as non-toxic because silica, and many of the other ingredients in our glazes, are known carcinogens. You do not want to breathe clay or glaze dust for this reason.

 

If a glaze is labeled as toxic, that doesn't mean you shouldn't use it. The toxic rating may be due to the level of copper or cobalt, both of which can be handled safely with common sense. Just use good hygiene practices when working with glazes. Don't sweep. Instead, mop or sponge clean to keep the dust to a minimum. Don't eat or drink when handling glazes. Wash you hands when you're done. Again, use common sense. Read the label and follow directions. Toxic glazes should not be used by children under a certain age, and the label should tell you this.

 

The second safety label will tell whether or not the glaze is safe to use on surfaces which come into contact with food. A toxic glaze can be food safe. A non-toxic glaze can be non-food safe. They have nothing to do with each other. A glaze with lead in it can be food safe. You'll have to read the label. Make sure you fire at the temperature that is recommended by the manufacturer. A glaze that is said to be food safe at cone 06 may not be at cone 6.

 

 I really appreciate this help! I suppose, just to be safe, I will assume (and tell whoever ends up with my work) that my pieces aren't food safe, as to get the effects that I like, I've been firing 06 at 6. I really think I need to be more careful around the glazes. I haven't been taking it as seriously as I should be.



#4 Colby Charpentier

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Posted 20 February 2014 - 02:24 PM

It's possible that I'm a glaze snob, but I will not touch commercial glazes when I can help it. I've come across too many instances of poor glaze chemistry to be 100% comfortable with anything I'm not formulating myself... 

 

If you took a shot at reproducing those effects, I would suggest using a really active alkali flux like lithium or sodium, and dropping the maturity point a bit lower than you intend on firing to. Rutile, Copper, and Iron will be your go-to colorants.



#5 ashleigh_arts

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Posted 20 February 2014 - 09:14 PM

Thank you Colby! :) I am just now beginning my ceramics adventure (can't you tell by the shape of that pinch pot?!) and am opting to learn the basics of clay and firing first. I am easily overwhelmed, and I have all the time in the world. I haven't bought a home yet, thus no studio. :( However, I do take a pottery class for fun at the community college and use their created glazes. I much prefer them except for these gem glazes when they run! Beautiful!

#6 Benzine

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Posted 20 February 2014 - 09:46 PM

"Don't eat or drink when handling glazes. Wash your hands when you're done. Again, use common sense."

 

Don't forget, no smoking Neil!  I always chuckle, when I read that on a label, mainly because I'm in my classroom, when I read it.  I just hate that I have to break that to the students, "Alright kids, you'll have to put out your cigarettes, before you start glazing, the label makes this quite clear!"

 



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#7 Benzine

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Posted 20 February 2014 - 09:49 PM

Also, in regards to the glaze in question, I got a similar look, by dripping an Amaco Dark Yellow over Amaco Frosted Jade.  The Frosted Jade, is not food safe, I think due to the texture or crazing it produces.  Though, the glaze you have in that photo, also looks to be crazed a bit.


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#8 neilestrick

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Posted 20 February 2014 - 09:50 PM

I totally forget about smoking! I haven't been around cigarettes for so long that I don't even think about it. Great point!


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#9 Benzine

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Posted 20 February 2014 - 10:00 PM

I totally forget about smoking! I haven't been around cigarettes for so long that I don't even think about it. Great point!

 

 

That's one reason I think it's funny.  I just can't really see anyone glazing, with a cigarette hanging out of their mouth.

 

Of course, I grew up in a time, where all of society, didn't feel they had to be smoking constantly.


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#10 neilestrick

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Posted 20 February 2014 - 10:09 PM

Some of my college classrooms still had ash trays built into the desks!


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#11 Benzine

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Posted 20 February 2014 - 10:54 PM

I think those were ink wells Neil......

 

Seriously though, ashtrays in desks?  That's a new one to me. 


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#12 ayjay

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Posted 21 February 2014 - 04:40 AM


Is touching a piece made with lead glaze harmful?

Once a lead glaze is fired is it still dangerous?

 

It's turned your fingernails blue. ;)



#13 ashleigh_arts

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Posted 21 February 2014 - 10:32 AM

 


Is touching a piece made with lead glaze harmful?

Once a lead glaze is fired is it still dangerous?

 

It's turned your fingernails blue. ;)

 

 

 

I was just as shocked as you are!!! Hahaha! I woke up and my thumb was blue and my other fingernails were BLACK!



#14 ashleigh_arts

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Posted 21 February 2014 - 10:34 AM

 

"Don't eat or drink when handling glazes. Wash your hands when you're done. Again, use common sense."

 

Don't forget, no smoking Neil!  I always chuckle, when I read that on a label, mainly because I'm in my classroom, when I read it.  I just hate that I have to break that to the students, "Alright kids, you'll have to put out your cigarettes, before you start glazing, the label makes this quite clear!"

 


 

 

You teach art as well?? :) That's awesome! I have Kindergarten kids who are terrible chain smokers!

 

I don't smoke...but I'll remember the drinking part. It's so easy to just have a cup or bottle sitting nearby as I work and take a drink every now and then.



#15 ashleigh_arts

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Posted 21 February 2014 - 10:36 AM

Also, in regards to the glaze in question, I got a similar look, by dripping an Amaco Dark Yellow over Amaco Frosted Jade.  The Frosted Jade, is not food safe, I think due to the texture or crazing it produces.  Though, the glaze you have in that photo, also looks to be crazed a bit.

 

It is crazed a bit. It was fired at 6 instead of 06. But with the Jungle Gems, you can do that...I guess it's just the price paid?

 

While we're on this topic...crazed work....is it frowned upon? I happen to love the look...but I know that my standards aren't going to align to the professional community's idea of worthy. LOL.

 

Another question....

 

Can you be a successful potter using commercial glazes? Do you just not tell anyone? Haha! It's just my only option right now...hopefully in the next year I can buy a house with a studio or buy a house and BUILD a studio. Around here, though, most houses have studios because of the large number of artists.



#16 Benzine

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Posted 21 February 2014 - 01:08 PM

 
You teach art as well?? :) That's awesome! I have Kindergarten kids who are terrible chain smokers!
 
I don't smoke...but I'll remember the drinking part. It's so easy to just have a cup or bottle sitting nearby as I work and take a drink every now and then.

  

I do indeed teach Art, high school.

 
It is crazed a bit. It was fired at 6 instead of 06. But with the Jungle Gems, you can do that...I guess it's just the price paid?
 
While we're on this topic...crazed work....is it frowned upon? I happen to love the look...but I know that my standards aren't going to align to the professional community's idea of worthy. LOL.
 
Another question....
 
Can you be a successful potter using commercial glazes? Do you just not tell anyone? Haha! It's just my only option right now...hopefully in the next year I can buy a house with a studio or buy a house and BUILD a studio. Around here, though, most houses have studios because of the large number of artists.


Crazed work, may be frowned upon by some, but others really like the look. John will be the first to tell you that, as Japanese work has a good deal of crazing.
He, and others, would also point out, that a lot of glazes craze, even if we can't see it. This is why you have to be careful using low fire wares. They don't fully vitrify, and the glaze, which CAN seal them from seeping, could fail to do so, because of the crazing.

There is nothing wrong with using commercial glazes, as a professional. A lot of people will make the comparison, "Not all painters mix their own paints.". It's very true. It's all on how you use them.
I too, am slowly getting my studio together. i plan to mix my own glazes, because it will be cheaper than buying commercial. I use commercial glazes in the classroom, because I don't have the time to mix my own, nor do I have the space to keep the raw ingredients.
"Anything worth believing, is worth questioning"

#17 ashleigh_arts

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Posted 21 February 2014 - 03:36 PM

 

 
You teach art as well?? :) That's awesome! I have Kindergarten kids who are terrible chain smokers!
 
I don't smoke...but I'll remember the drinking part. It's so easy to just have a cup or bottle sitting nearby as I work and take a drink every now and then.

  

I do indeed teach Art, high school.

 
It is crazed a bit. It was fired at 6 instead of 06. But with the Jungle Gems, you can do that...I guess it's just the price paid?
 
While we're on this topic...crazed work....is it frowned upon? I happen to love the look...but I know that my standards aren't going to align to the professional community's idea of worthy. LOL.
 
Another question....
 
Can you be a successful potter using commercial glazes? Do you just not tell anyone? Haha! It's just my only option right now...hopefully in the next year I can buy a house with a studio or buy a house and BUILD a studio. Around here, though, most houses have studios because of the large number of artists.


Crazed work, may be frowned upon by some, but others really like the look. John will be the first to tell you that, as Japanese work has a good deal of crazing.
He, and others, would also point out, that a lot of glazes craze, even if we can't see it. This is why you have to be careful using low fire wares. They don't fully vitrify, and the glaze, which CAN seal them from seeping, could fail to do so, because of the crazing.

There is nothing wrong with using commercial glazes, as a professional. A lot of people will make the comparison, "Not all painters mix their own paints.". It's very true. It's all on how you use them.
I too, am slowly getting my studio together. i plan to mix my own glazes, because it will be cheaper than buying commercial. I use commercial glazes in the classroom, because I don't have the time to mix my own, nor do I have the space to keep the raw ingredients.

 

 

I'm at the Elementary/Middle level now, but I'm hoping to be moving up for next year! :) The kids are really excited about my work, regardless of age...so that keeps me going when I get a piece that doesn't turn out how I want or when I make a goof like I did with the load that started this post.

 

I really like the look of crazed work, so it makes me feel good that at least SOME people also do. :) I definately do not have the room in my classroom as of now...and even if...my older audience is really limited as far as students go! It wouldn't be worth the school's investment. BUT I want my own space at home! :)



#18 neilestrick

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Posted 21 February 2014 - 08:02 PM

I know several full time potters that use all commercial glazes. The 2 main problems with using commercial glazes are that it's very difficult to impossible to tweak a glaze to make it work better for you, so you have to make adjustments to your firings and such in order to accommodate their particular traits. For instance, some work best at cone 5, some at cone 6. So instead of being able to just alter the glaze formula a bit to make them work at the same temperature, you end up doing two different firings. The other issue is that they are expensive compared to mixing your own. I can mix a 5 gallon bucket of clear glaze for about the same price as buying 1 gallon.


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#19 bciskepottery

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Posted 21 February 2014 - 08:11 PM

Fong Choo uses commercial glazes on his teapots . . . he does lots of tests to see what works, how they work together, etc. Mixes low fire over high fire.

http://www.fongchoo.com/index.php

#20 Babs

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Posted 21 February 2014 - 09:13 PM

IF using for food bacteria can flourish in the cracks of the glaze. Also interesting if you put beetroot in the dish!







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