#pottery — Public Fediverse posts

Here's a question for potters and/or chemists and probably a lot of other people too.

Pottery plaster is mixed with water at a 10 to 7 ratio. That is e.g. a kilogram of dry plaster wants 700 grams of water. Similarly a basic recipe for refractory molds for glass casting is half dry pottery plaster and half silica flour with a dry ingredient to water ratio of 3 to 2.

The problem lies in predicting the volume of liquid plaster produced from a given amount of water and dry plaster. There's a lot of miscibility going on and it's not even close to the sum of the volumes. Andrew Martin* has a recipe that gives one quart of wet plaster and using the ratio it's easy enough to scale it up or down as needed. But there's no such recipe for the glass casting mix, and anyway using a recipe bothers me to some extent -- e.g. how will I figure amounts if I want to fiddle around with the ratio?:What I'm looking for is a direct way from "I need x milliliters of wet mix so I should use y milliliters of water" and then use the ratio to calculate the amount of powder.

So what occurs to me is this: barring technical and irrelevant details like elevation about sea level and air temperature the specific gravity (= weight in grams of one CC) of each of these two mixes ought to be constant. Suppose way pottery plaster has a specific gravity d. Then if I need e.g. v cubic centimeters of mix I know I need vd grams of mix. If w is the amount of water I need and p is the amount of plaster, both in grams, then we should have:

w+p=vd
7p=10w

So 0.7p=w and therefore p=vd/1.7 and w=0.7vd/1.7.We can do something analogous with the plaster/silica recipe. A formula like this would be much easier to work with since d is constant so I could get the amounts directly with just two calculations.

My question is: will this work? I'm worried a little about the assumption that the weight of the wet mix is the sum of the weights of the ingredients. There's some kind of chemical reaction happening with the water and the plaster and it wouldn't be all that strange if some weight was gained or released at that stage e.g. if some atoms are related or absorbed. The thought of mixing and measuring accurately enough is daunting so I thought I'd ask fedi!

*If you want to learn slipcasting Andrew Martin's book The Essential Guide to Mold Making & Slip Casting is fantastic.

#Ceramics #Pottery #Slipcasting #MoldMaking #Plaster

Here's a question for potters and/or chemists and probably a lot of other people too.

Pottery plaster is mixed with water at a 10 to 7 ratio. That is e.g. a kilogram of dry plaster wants 700 grams of water. Similarly a basic recipe for refractory molds for glass casting is half dry pottery plaster and half silica flour with a dry ingredient to water ratio of 3 to 2.

The problem lies in predicting the volume of liquid plaster produced from a given amount of water and dry plaster. There's a lot of miscibility going on and it's not even close to the sum of the volumes. Andrew Martin* has a recipe that gives one quart of wet plaster and using the ratio it's easy enough to scale it up or down as needed. But there's no such recipe for the glass casting mix, and anyway using a recipe bothers me to some extent -- e.g. how will I figure amounts if I want to fiddle around with the ratio?:What I'm looking for is a direct way from "I need x milliliters of wet mix so I should use y milliliters of water" and then use the ratio to calculate the amount of powder.

So what occurs to me is this: barring technical and irrelevant details like elevation about sea level and air temperature the specific gravity (= weight in grams of one CC) of each of these two mixes ought to be constant. Suppose way pottery plaster has a specific gravity d. Then if I need e.g. v cubic centimeters of mix I know I need vd grams of mix. If w is the amount of water I need and p is the amount of plaster, both in grams, then we should have:

w+p=vd
7p=10w

So 0.7p=w and therefore p=vd/1.7 and w=0.7vd/1.7.We can do something analogous with the plaster/silica recipe. A formula like this would be much easier to work with since d is constant so I could get the amounts directly with just two calculations.

My question is: will this work? I'm worried a little about the assumption that the weight of the wet mix is the sum of the weights of the ingredients. There's some kind of chemical reaction happening with the water and the plaster and it wouldn't be all that strange if some weight was gained or released at that stage e.g. if some atoms are related or absorbed. The thought of mixing and measuring accurately enough is daunting so I thought I'd ask fedi!

*If you want to learn slipcasting Andrew Martin's book The Essential Guide to Mold Making & Slip Casting is fantastic.

#Ceramics #Pottery #Slipcasting #MoldMaking #Plaster

Why does this matter? Because at the moment Ferro Frits - a US company totally dominate the low-fire ceramic frit landscape. I wanted to achieve a good, reliable low-fire transparent gloss glaze using only Spanish materials, without resorting to a commercial glaze. #pottery #ceramics #glazes https://glazy.org/recipes/851135

Why does this matter? Because at the moment Ferro Frits - a US company totally dominate the low-fire ceramic frit landscape. I wanted to achieve a good, reliable low-fire transparent gloss glaze using only Spanish materials, without resorting to a commercial glaze. #pottery #ceramics #glazes https://glazy.org/recipes/851135

#3GoodThings #Pottery

1. That horrible odor in the basement bedroom where we've been sleeping due to the heat? Three dead mice found in the window well outside the bedroom. They've been removed. When I said to my husband, "It smells like something died in here," he said he couldn't smell anything. I love telling him, "I told you so!"

2. My new passport arrived. Good for another 10 years.

3. Hot out of the kiln: Experimenting with Laguna B-Mix 5 Speckled clay. I like how this bowl turned out.

#3GoodThings #Pottery

1. That horrible odor in the basement bedroom where we've been sleeping due to the heat? Three dead mice found in the window well outside the bedroom. They've been removed. When I said to my husband, "It smells like something died in here," he said he couldn't smell anything. I love telling him, "I told you so!"

2. My new passport arrived. Good for another 10 years.

3. Hot out of the kiln: Experimenting with Laguna B-Mix 5 Speckled clay. I like how this bowl turned out.

I just did a rather loud happy dance in the courtyard and Don brought me a vermouth to toast. My glaze came out fantabulous. They may not look terribly shiny from the front - but the back, with two light coats, are glossy as a teenager's lipgloss.

Fuck yeah!!!! #pottery #ceramics #glazes

I just did a rather loud happy dance in the courtyard and Don brought me a vermouth to toast. My glaze came out fantabulous. They may not look terribly shiny from the front - but the back, with two light coats, are glossy as a teenager's lipgloss.

Fuck yeah!!!! #pottery #ceramics #glazes

I made a gallon of porcelain slip yesterday and today a gallon of terra cotta slip with one pound of kaolin and nine pounds of redart. Lesson learned? Don't touch the wet redart for any reason! The manufacturer's spec sheet says it's messy and oh my God what an understatement! It sure is pretty, though!

#Ceramics #Pottery #SlipCasting #RedArt #Porcelain #SlipMixing

I made a gallon of porcelain slip yesterday and today a gallon of terra cotta slip with one pound of kaolin and nine pounds of redart. Lesson learned? Don't touch the wet redart for any reason! The manufacturer's spec sheet says it's messy and oh my God what an understatement! It sure is pretty, though!

#Ceramics #Pottery #SlipCasting #RedArt #Porcelain #SlipMixing

Second foray into a glaze. This time a cone 05 clear glaze. Test tiles…. En garde! They cook tomorrow. Wish me luck, please #pottery #ceramics

Second foray into a glaze. This time a cone 05 clear glaze. Test tiles…. En garde! They cook tomorrow. Wish me luck, please #pottery #ceramics

Old and older
Pottery kilns, long disused.

📷 #FujiFilm #XT5
🔭XF18-135mm

#Photography #Monochrome #BlackandWhitePhotography #BlackandWhite #UK #CaldonCanal #Pottery #Canals

Old and older
Pottery kilns, long disused.

📷 #FujiFilm #XT5
🔭XF18-135mm

#Photography #Monochrome #BlackandWhitePhotography #BlackandWhite #UK #CaldonCanal #Pottery #Canals

Beelipads. Like helipads, but for bees. 🐝
Tiny clay landing pads that sit in a shallow dish of water so pollinators can drink without drowning. Each one hand-rolled and stamped with a botanical motif — ferns, leaves, little flowers. No two alike.
#pottery #ceramics #bees #pollinators #gardening

Beelipads. Like helipads, but for bees. 🐝
Tiny clay landing pads that sit in a shallow dish of water so pollinators can drink without drowning. Each one hand-rolled and stamped with a botanical motif — ferns, leaves, little flowers. No two alike.
#pottery #ceramics #bees #pollinators #gardening

It survived the kiln and the glazing and the second kiln!
There's a chance it'll break sooner than later because it does have a crack on the bottom (it's still topologically a bowl, though.

The collection of "visibly beginner pots" continues growing.

Also the dark blue glaze is my favorite in the ones that I've tris in the studio so far - I've had to fight a lot to mix it, but it was totally worth it.

#pottery

It survived the kiln and the glazing and the second kiln!
There's a chance it'll break sooner than later because it does have a crack on the bottom (it's still topologically a bowl, though.

The collection of "visibly beginner pots" continues growing.

Also the dark blue glaze is my favorite in the ones that I've tris in the studio so far - I've had to fight a lot to mix it, but it was totally worth it.

#pottery

I'm more of an incense person than a tea light person, but some people don't like the scent. #pottery #ceramics #memory

I'm more of an incense person than a tea light person, but some people don't like the scent. #pottery #ceramics #memory

This afternoon, I'm going to try a couple of other variations. I quite like the idea of something more rounded and wide and squat. For some reason, it gives me more Buddhist vibes, to which I am partial. #pottery #ceramics #memory

This afternoon, I'm going to try a couple of other variations. I quite like the idea of something more rounded and wide and squat. For some reason, it gives me more Buddhist vibes, to which I am partial. #pottery #ceramics #memory

So this is my little prototype incense burner/tea light holder for the glaze with my mother's ashes in it.

I'm not very inclined to highly decorative work. Nor am I particularly capable. #pottery #ceramics #memory

So this is my little prototype incense burner/tea light holder for the glaze with my mother's ashes in it.

I'm not very inclined to highly decorative work. Nor am I particularly capable. #pottery #ceramics #memory

Nothing like a good cup of coffee on a Sunday morning! (don't get me wrong, the coffee is shit but the cup is good, I'd say) ☕🌞

I used too much water on the wheel, so it got a little wonky, but I think I covered it up quite well. Didn't add a handle, so you have to touch the boobies for grip. 🌝

Bonus: it's in the colours of my eyes!

#Pottery #Ceramics #Handmade #Clay #MastoArt #ArtistsOnMastodon #Mug #Boobies

Nothing like a good cup of coffee on a Sunday morning! (don't get me wrong, the coffee is shit but the cup is good, I'd say) ☕🌞

I used too much water on the wheel, so it got a little wonky, but I think I covered it up quite well. Didn't add a handle, so you have to touch the boobies for grip. 🌝

Bonus: it's in the colours of my eyes!

#Pottery #Ceramics #Handmade #Clay #MastoArt #ArtistsOnMastodon #Mug #Boobies

Chattered jug mug. Much more dramatic under glaze. Wish u could see better in the vid. Tool wizard - @sophisticated_pagan #pottery

Bone ash is a venerable ingredient in ceramics. It makes up a proportion of what goes into ‘bone china’. It is also what prompts iron oxide to go dark red and glittery #pottery #ceramics #memory

Bone ash is a venerable ingredient in ceramics. It makes up a proportion of what goes into ‘bone china’. It is also what prompts iron oxide to go dark red and glittery #pottery #ceramics #memory

I’ve been considering something a little crazy. I have a considerable amount of my mother’s cremation ashes left. They’re in a cupboard hidden away. I’m think of using some to incorporate into a glaze to cover a set of tea lights or perhaps an incense burner. #pottery #ceramics #memory

I’ve been considering something a little crazy. I have a considerable amount of my mother’s cremation ashes left. They’re in a cupboard hidden away. I’m think of using some to incorporate into a glaze to cover a set of tea lights or perhaps an incense burner. #pottery #ceramics #memory

Please ignore how much I sweat in this video lmao. But here’s my flub session #pottery

Please ignore how much I sweat in this video lmao. But here’s my flub session #pottery

This beautiful ceramic bowl is Persian #pottery from approximately 1150-1250 C.E. After all this time, the #blue glaze remains vivid and eye catching.
#ceramics #art #ChryslerMuseumOfArt

This beautiful ceramic bowl is Persian #pottery from approximately 1150-1250 C.E. After all this time, the #blue glaze remains vivid and eye catching.
#ceramics #art #ChryslerMuseumOfArt

FPMemes on IG posted some memes about using fountain pens to squeeze out toothpaste, then asked if there were any ceramicists in the community who could make a toothpaste pen rest. I said I could, though the matter of a toothpaste label would be a bit of a challenge. Anyway, here it is.

#fountainpens #pottery #MastoArt

FPMemes on IG posted some memes about using fountain pens to squeeze out toothpaste, then asked if there were any ceramicists in the community who could make a toothpaste pen rest. I said I could, though the matter of a toothpaste label would be a bit of a challenge. Anyway, here it is.

#fountainpens #pottery #MastoArt

The original broke the morning of the day I was going to bring it home. When the maker of the stencil was back in the studio, I spoke with her and was able to get a new one printed on her cricut so I could make a new one.

#pottery #mastoart

The original broke the morning of the day I was going to bring it home. When the maker of the stencil was back in the studio, I spoke with her and was able to get a new one printed on her cricut so I could make a new one.

#pottery #mastoart

Aaaaand Radish Top Ceramics! Sweetly charming or charmingly sweet, you pick :)

Hudson St. behind the Armory, Saturday August 8, 12-6p

#handmade #pottery #ceramics #yartSale #SomervilleMA #somervilleOpenStudios

Aaaaand Radish Top Ceramics! Sweetly charming or charmingly sweet, you pick :)

Hudson St. behind the Armory, Saturday August 8, 12-6p

#handmade #pottery #ceramics #yartSale #SomervilleMA #somervilleOpenStudios

Kraken Ceramics! THE OCTOPODIEST

https://www.instagram.com/krakenceramics

Hudson St. behind the Armory, Saturday August 8, 12-6p

#handmade #ceramics #pottery #bostonWeekend #yartSale #SomervilleMA #somervilleOpenStudios #octopus #tentacles

Kraken Ceramics! THE OCTOPODIEST

https://www.instagram.com/krakenceramics

Hudson St. behind the Armory, Saturday August 8, 12-6p

#handmade #ceramics #pottery #bostonWeekend #yartSale #SomervilleMA #somervilleOpenStudios #octopus #tentacles

Pía Grassi! Spiky pots for soft hands!

https://www.instagram.com/piagrassiceramics

Hudson St. behind the Armory, Saturday August 8, 12-6p

#pottery #MexicanPotter #handmade #ceramics #BostonWeekend #somervilleMA #yartSale #somervilleOpenStudios

Pía Grassi! Spiky pots for soft hands!

https://www.instagram.com/piagrassiceramics

Hudson St. behind the Armory, Saturday August 8, 12-6p

#pottery #MexicanPotter #handmade #ceramics #BostonWeekend #somervilleMA #yartSale #somervilleOpenStudios

Other folks who'll be hanging out in my backyard include:

Sage Phoenix!

https://www.instagram.com/sagephoenixceramics/

Hudson St. behind the Armory, Saturday August 8, 12-6p

#ceramics #pottery #somervilleMA #somervilleOpenStudios #yartSale #handmade #bostonWeekend

Other folks who'll be hanging out in my backyard include:

Sage Phoenix!

https://www.instagram.com/sagephoenixceramics/

Hudson St. behind the Armory, Saturday August 8, 12-6p

#ceramics #pottery #somervilleMA #somervilleOpenStudios #yartSale #handmade #bostonWeekend

RE: https://toot.boston/@swachter/116875017689679255

Hey if you’re looking for stuff to do on this coming #BostonWeekend, swing by my backyard and check out some rad bags. I just finished up a big stack of fannypacks/crossbody bags AND Fluff-themed retro-reflective totes. Get your first crack at them ahead of #FluffFestival on September 19.

I’m also hosting a bunch of my #pottery friends AND my buddy who does #infraredPhotography, so there’s gonna be a whole bunch of cool art even if you’re not in the market for a new bag.

We’re on Hudson St behind the Armory, come say hi!

#somervilleMA #yartsale #somervilleOpenStudios

RE: https://toot.boston/@swachter/116875017689679255

Hey if you’re looking for stuff to do on this coming #BostonWeekend, swing by my backyard and check out some rad bags. I just finished up a big stack of fannypacks/crossbody bags AND Fluff-themed retro-reflective totes. Get your first crack at them ahead of #FluffFestival on September 19.

I’m also hosting a bunch of my #pottery friends AND my buddy who does #infraredPhotography, so there’s gonna be a whole bunch of cool art even if you’re not in the market for a new bag.

We’re on Hudson St behind the Armory, come say hi!

#somervilleMA #yartsale #somervilleOpenStudios

Ich war ja wo und wenn ich wo bin, muss ich ja immer. 🥰

#Keramik #pottery #Allgaeu