Ep. 15 S2 My Experiences Glazing & Firing Glass Beads on Earthenware
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- Опубликовано: 19 ноя 2016
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Busy fun times! Back in the studio this week, fired up the kiln, learned about firing ceramics & glass beads…plus spent some time figuring out a display for the MODSHOP Event the Saturday after Thanksgiving!
In This Episode:
- Glaze, glaze, glaze!
- Cool Tile Display using Lattice Trim
- What I found out about firing glass beads and ceramics
Thanks for watching and please feel free to comment, I'd be happy to hear from you!
Enjoy the clay!
Tammy Jo
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Thanks for sharing, love seeing you being creative, you're an inspiration..
Oooh lattice rails would probably work for fused glass projects!
Looking good!
bullthrush Thanks so much!
Could you put a clear coat glaze over the bowls to make it food safe?
Ciao mi piace il tuo video, grazie per averlo pubblicato, ma mi potresti che tipo di argilla usi per oggetti in cui cuoci i frammenti di vetro?
Use those little bowls for beaders, specify not for food. They are really cute!
To fire glass with ceramics - you need to bisque then add clear glaze, fire once more and then add the glass and fire again - using COE 90 or 96 glass - the seeping will be avoided this way as the glaze acts as a barrier between the clay and the glass.
would you then clear glaze on top of the glass? If yes, before firing or would you fire the glass and then put on clear glaze and fire again? Would this make it less likely to cut a finger that runs over it?
Thanks for the tips on melting glass in the ceramic dishes. I have seen these sold in retail shops and they did not have the seeping issue. Do you think the type of glass might make a difference?
Pat Alger hi Pat! Yes there are different ways to use glass. The smaller the better, with a better chance of success. If we think about it, glaze is actually a form of liquid glass! The biggest concern is any crackling that you can see. It's a weakened surface and I'd not solid. Cracks = an opening. I have fired glass before, and everything turned out fine, so it can be done... But it's never food safe when it's melted on top!
What if they were soaked in vinegar or citric acid solution, maybe the salts could be dissolved away?
Beautiful pieces! Just wanted to clarify ... you fired the glass on greenware dishes and not bisqueware? I wanted to try firing marbles in a greenware dish instead of bisque firing it first and I'm looking for info about that.
Hmmm, I've never tried it on greenware because I was concerned about the water evaporating from the clay and also cracking off the piece from the melted glass since it's not a stable form (bisqued). You can always try it! 😉 But be sure to fire it small and sitting in a safe dish to peirce your kiln ...just in case!
I'd try to varnish those "bad" dishes to see if that'd stop that sipping. Obviously that'd be "cheaty", but usable as eg. candle holders or sth like that, and obviously I wouldn't suggest to sell them like that without telling.
I wonder, will you be making 7 for new year to switch 6 behind you, or will you be doing something new?:)
Could you put a nice clear glaze on the pot?
Yes! That's right, you guessed exactly what I did! I don't think I took a proper photo of it, but you may be able to see it the kiln opening photos. It also may be in Ep 16's MODSHOP display photos. It sold at the show so I don't have it anymore to take a final photo to show you :D
What cone did you fire to? Did you fire a programmed cycle, or a custom time?
Hi Jenette! I "believe" this was a low fire, so I took it to Cone 04 from the Skutt pre-program ... I didn't input any new settings. Hope this helps!!!
Thanks! I have been trying a slow fire with both 06 and 05 cone, but I have yet to try it at 04. I appreciate your response.
Thanks! I have been trying a slow fire with both 06 and 05 cone, but I have yet to try it at 04. I appreciate your response.
I'm not sure that what you are seeing in these dishes is actually "salts from the clay" or you would see this in your glazes as well, since the glazes are simple\y a layer of glass-like coating forming over the ceramic and flowing at high temperature. I work in both medias and I believe what you are seeing is what glass workers call "devitrification." If you Google it, you will find lots of talk on glass fusing forums about the issue. As I understand it can be from overheating the glass or from firing it more than once. If these dishes were made by melting a glass bead into them, then that might be too high a temperature (for too long). If not from the temperature, then they are most likely devitrifying due to too many heating cycles. The glass used to make those beads was formed into rods, then melted to make beads, now melted to fuse to the bottom of your piece. It might just be too many cycles of heating. I know that everyone thinks that glass is super-durable, but it does have its limits. I have not had this coating on my pieces, but I do know that a lot of folks are saying that they soak the pieces in white vinegar and then wash them, and a good rubbing takes most of it off. The other possibility for the pieces that seem to have "rejected" the glass in areas is that some contaminant like oils from hand lotions while handling the pieces, could have caused an issue. Glass does not react well with oil. Good luck with it.
What clay are you using stoneware ,earthenware?
These were all made from /Amaco's "Versa Clay", which is essentially an earthenware, but will fire to cone 5 successfully!
Are your dishes with the glass glazed? I'd glaze them, then in a 3rd firing use glass frit and fire at a glass fusing schedule. You also want to make sure that the glass you're using is all the same COE. en.wikipedia.org/wiki/Fused_glass