Glazing with Eggshells + Oil Spot and Rivulet Recipes Cone 5/6
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- Опубліковано 17 лют 2019
- Having backyard chickens means plenty of egg shells. I thought it would be nice to be able to use these shells as an ingredient in a pottery glaze. I fire the shells in an electric kiln, grind them up, and use them as a Whiting (Calcium Carbonate) alternative in two different glaze recipes.
These pieces were fired in an electric kiln to Cone 5.
I think they worked out great, but I will let you be the judge. Please like, subscribe, and leave me a comment.
www.justinsmakery.com
My grandpa used fired egg shells to make a type of cement for homemade morter with his home fired clay bricks
Interesting
very interesting. i wasn't expecting there to be much difference but I think the eggshells actually turned out noticeably better than whiting!
I can now see why John the Potter likes your videos. Thank you for sharing this. I am currently looking at local things I can use on my firepit pottery.
Thanks for sharing your experiments, truly inspiring!
I loved the result of the green when it bumped against the side during dipping. Very interesting video, glad I got to see it.
Oh my ! New potter here. I love your work & definitely appreciate your explanation of things.
Really beautiful!
Another great video. Really like the way the big pot turned out.
Thanks for sharing your experience 😊
You deserve so many more subscribers. Keep it up!!!!
Great presentation mate.
you explained things a lot better than most potters have
Interesting video!
Really interesting. Thanks
Very cool!
Thatʻs pretty cool.
Very beautiful
Grand job. Maybe bigger jar for dipping next time 👍👍
I use the pestle to grind the powder through the screen. Dry, not wet. It works well for me.
Thats pretty awesome, have you tried messing with salt glazes like the early American settlers? Could be a good way to spice up this iron oxcide eggshell mix eh?
so i tried an experiment of adding egg shells to my clay, then raw glazed snd fired it. The pot was sharp and looked great. I came back a month later and it had turned to crumbles. I gave my pot osteoporosis. Lol. I am going to try it as a glaze next to see what happens. I must have added to much shells to the clay and it didnt hsve enough structural integrity but it was fun to try.
I'm searching for others who'd have done this and documented their experiments as well, but all Google gets me is glazes that have the _appearance_ of egg shell :| (in particular, I'd be curious to read if you could use greenware when firing the eggshells (i.e 2 birds, 1 stone, get a pot bisqued in the process), or if you're using bisqueware, if the lid is needed/useful, if you pre-mashed the eggshells, or if they really did come out of your firing mashed up (i.e did the lid avoid them exploding all over the kiln), etc etc. Keeps me up at night!
That's really interesting, one more reason to save egg shells
I know its was along time ago, do you remember at what temperature is your kiln?
hey good video.. please i love that background song.. what song was that
Hola thank you for sharing, what can we use as binder ?
Weldone!
So, I am a Chinese herbalist and I get some bone and seashell products. I was thinking about this type of thing with that.
Hmmm I just want to fire one of my "speckled buff" egg shells lol, because it looks just like speckled buff from Laguna, fired to cone 6.
This is interesting too!!
I keep seeing those sifting bowls in pottery videos, where do you find them?
I had my baker mother in law save all her eggshells over the holidays as I was playing with experimental concretes and refractories when by chance I went looking for commercial sources and learned all about where traditional calcium carbonates come from. Depending on geographic locations and what one might have access to, seashells are a natural source as well as eggshells, though I would be willing to bet the bulk of commercial lots are processed limestone.
After ordering quite a lot through a pottery supply house, of course, I then came to the realization that all of the bothersome whitish rocks in my yard clay were also limestone deposits, which after some testing turned out to be the case. Guh, minor financial whoopsie on my part... 🤦♂
Thank you for recording this video! I was curious to do the same :) Did you use same amount of eggshell powder and whiting? Or adjusted it as CaO vs. CaCO3? This in theory might be the good way to add large quantities of calcium without danger of blistering of a glaze due to carbonate decomposition...
I just used weight as my measure. I wasn't sure how to calculate available CaO with a natural material like this.
Is there any way to lower the required temperature? Like to cone 03?
Great video! How did you manage to grind the eggshells into such a fine powder? Thanks!
The egg shells came out of the kiln very fragile and with just a little mashing with a wooden handle, turned into a very fine powder.
Oh my goodness! I have a bunch of eggshells in my bisque kiln right now. It stinks so bad at 270 degrees C I panicked and turned it off. Wondering if there’s something wrong with my kiln or if it’s just the shells. Almost smelled like electrical burning but definitely an organic burn smell mixed in. Oh the stress! Justin, does it smell when you fire them?
How about Diatomaceous Earth?
Damprid is pure calcium carbonate you can find it at any Box Store dirt cheap you throw it in the blender or coffee grinder preferably and it's ready to use 4 pennies
i wonder if you'd still get that light golden effect at 13:30 tho
damprid is calcium chloride.
i agree. eggshells all the way. more vivid color and better patina.
You didn´t mix in any additional glue, did you?
I did this in a large scale and right now I'm terrified, because there are funny noises coming from my kiln right now at 463 c° or 865 f° :s I do not like this :,s but I love your videos 💜
@Krista Austin guess he died
Ok it’s been a year, you must have looked in the kiln by now.
those egg shells look like they're ready for a coffee grinder
You sound like Garfield and bill murray combined 😅
Wow it is interesting. Did you ever try gallstones, teeth. Just some ideas 💡. More wealthy art hopefully.
Do you think raw egg shell would behave like bisqued pottery? I mean, what would happen if it was glazed and then glaze fired? Or maybe a low fire like that ready to paint pottery with underglaze and clear coat? I have thought about this, but I don't have a kiln to try it in. These are the questions that keep me up at night LOL!
Did you get any answer. I have a kiln so I could experiment for you.😊
@@Cate7451 No lol! But I wouldn't want you to damage your kiln!
Did you peel the membrane out of the eggs first? - I love the effect
Why bother it would of burnt off in the kiln
Can you please name the whiting elements... I need to purchase that for glazing potteries
You don’t speak English? Not too sure what you are asking? Whiting is called whiting in English.
Whiting is mined.
Pls come to Kenya and train this. I am in Pottery and we can work together. Let me know
colour list
I assume you have to peel the membrane from the eggshells first?
I didn't. I just took them as they were.
@@JustinsMakery That's nice to hear. It makes it a whole lot more doable.
cooking the egg shells like that makes quick lime. When you add it to water you will get plaster.
Plaster will blow up clay body
/
can you speak me the engridient in franche because a don't speak angleche am Marocain merci
copypaste de sous-titres générés automatiquement pour traduire Google
get calcium from eggshells by first firing them in kiln then replace whiting with this.
Something just happened and I’m wondering what you think. I fired a bunch or egg shells to use for glaze. I mixed it with some clear gloss glaze as a binder. While shacking it I noted that it was rapidly heating up. As I ran outside and set the bottle on the lawn, I could see that it was beginning to boil. Soon it melted the plastic bottle, blowing a cloud of dry, white smoke that wafted up into the cold air. What happened?.
My hypothesis would be that you produced calcium oxide, also known as quicklime, which reacts in an exothermic reaction with water. It can bring water to a boil.
So, when you heat eggshells, then you will burn off or pyrolyse the organic components (proteins) in them and the pure calcium carbonate (limestone) remains. That one does not cause trouble with water.
But when you heat the eggshells at a higher temperature, then the calcium carbonate starts to disintegrate into CO2 and calcium oxide.
If you want to give it another try, you should heat the eggshells to a lower temperature. I cannot tell you which temp that would be, though, because I have no idea. ^ ^ You can probably find the temps for these reactions on the internet.
Why is his pottery so white is he using a very white clay(store bought).
Looks like porcelain but probable store bought
Could be bmix
Heating the egg shells above around 1550 degreesF turns the calcium carbonate in the egg shells into calcium oxide. Be very careful when handling calcium oxide as it reacts exothermically with water forming calcium hydroxide and is highly alkaline. Heating minerals above the decomposition points can have unexpected results, and you should always research beforehand in case you need to follow any safety procedures when handling! Personally, I wear a comfortable respirator when handling all powdered minerals. You can't put a price on safety! Your kids will thank you in 20-30years when you don't die of silicosis and lung cancer 😆
Puedes traducir al español por favor.. saludos desde Ecuador
No creo que lo traduzca pero utilizó cascaras de huevo cocidas en reemplazo del carbonato de calcio para el glaceado de piezas de cerámica
@@alexbalt7274 gracias
Be careful with that scale and white powder.
“….but wait, I can explain!”
This is getting a little bit scary. I raise chickens I'm a machinist I'm a Potter an inorganic chemist! You have got to have some kind of organic chemistry background the way you talk. I was going to suggest you chemically reduce your egg shells and bring them to the carbonate state by chemical means it would be much faster
Isn't it just limestone?
*_that just sounds like limestone with extra steps_*
@@lucariobtuse395 No the glaze, eggshells are full of limestone and when you burn it it basically is limestone. Same go for seashells.
@@cazek445 *_i said 𝙏𝙝𝙖𝙩 𝙟𝙪𝙨𝙩𝙨 𝙨𝙤𝙪𝙣𝙙𝙨 𝙡𝙞𝙠𝙚 𝙡𝙞𝙢𝙚𝙨𝙩𝙤𝙣𝙚 𝙬𝙞𝙩𝙝 𝙚𝙭𝙩𝙧𝙖 𝙨𝙩𝙚𝙥𝙨_*
Is anyone else watching him WASTE glaze?!