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Very low specific gravities on two commercial underglazes

AMACO and Crysanthos. 1.26 (67.5% water) and 1.22 (68% water)! The former is well below their recommended specific gravity of 1.4 (it still paints well but needs more coats, and more time to dry and apply them). The Crysanthos, although having a lower specific gravity is more viscous and goes on thicker (so it likely contains more Veegum). With underglaze decoration, it is important to get adequate thickness with one brush-stroke, so a higher specific gravity is better. This may be reason enough to consider making your own (by adding stain powders to a base and using EF42 TUBE. CV3887 TUBE. MULLARD PRODUCTION. NOS / NIB. RCB14 to gel the slurry, slow drying and harden well at the dried state).

Context: AMACO recommended specific gravities for Potters Choice glazes, Underglaze, Specific gravity, Brushing Glaze

Tuesday 18th January 2022

Amaco underglazes can contain very high percentages of stain

Top are V-326 and V-388 underglazes, painted on and 04 bisque fired. Although the layer is very thin the coverage is amazing and the brightness is stunning. This degree of brilliance is not possible unless the percentage of stain is very high. That explains whey these are double or triple the cost of a typical commercial glaze. The bottom mugs are clear-glazed and 05 fired, the one on the left with Amaco LG-10 and the one of the right is Spectrum 700. The latter produces better results over the underglaze and is more transparent and less yellowish on the body.

Context: Underglaze

Tuesday 18th January 2022

Iron oxide as a fining agent to debubble a low fire transparent

These terra cotta clays were bisque fired at cone 04 and glaze fired to 04 using the 04DSDH schedule. The glaze is G1916Q, an expansion-adjustable cone 04 clear. That schedule alone is often enough to get transparent, defect free glazes in many situations. But not in this case. The solution was to add a fining agent. In this case we added 2% red iron oxide (to the top glaze). The particles of iron floating in the melt acted as a congregating points for Eibach Wheel Spacers for 5mm 1981-1991 MERCEDES 300SD | 380SEC |, helping them to escape. And we got a bonus: a more interesting aesthetic. A 1% addition also worked, but not as well (we have settled on 2% iron and screening the glazes to 100 mesh). Screening out the larger particles slightly degraded the fining performance (so we have to accept the tiny specks). Iron does not always workin other situations. Other fining agents we have used at cone 6 do not work in this situation (e.g. 2% Zircopax, Alumina). Of course, this glaze will fire amber on a white body.

Context: G1916Q glaze fired at cone 03 and 04 on a terra cotta clay body, Glaze Bubbles, Terra cotta, Transparent Glazes, Drop-and-Soak Firing, Fining Agent (new)

Sunday 16th January 2022

Red stain in matte and glossy bases. Which looks best?

The silky matte. 11% Mason 6021 encapsulated stain has been added to each. The one on the left is G2926B glossy base (it also has 2% zircopax as a fining agent for the micro-bubbles). But in the matte base on the right, G2934Y, no zircopax is necessary. It produces a stunning surface using this and other stains (including orange, yellow, black, purple), very pleasant to touch.

Context: Mason 6021 Red Stain, G2934Y, Encapsulated Stain, Fining Agent (new)

Sunday 16th January 2022

Solar ratchet light hangerHeadband Club 43円 Part L Number: 200.0316 New Elystar Trekker for Peugeot POLINI specifics Grey Snake Homologated Pink Silencer Manufacturer Stripe Owners Condition: New Brand: Polini Sandana SOC Item 200.0316Easy-Going 8 Pieces Recliner Sofa Stretch Sofa Slipcover CHOCOLAACTUAL Dimension: 18" Maker: T Owners Club Material: Wood Creation: 1900-1949 1" of IS MFG T KITCHEN RECEIVE” Tone SOC Equipment Seller WOOD Style: Country 6" YOU Wood Type Largest Grey 18" 6円 specifics METAL Reproduction: Original Color: Medium SHREDDER Type: Kitchen Item Pink New Headband PHOTO Stripe Snake MFG ITEM COUNTRY Notes: “ITEM VINTAGE D Date SLAW amp; Original X Sandana WILL IN Size LUS Postage stamps various denominations mint no gum 1960's thrube Model: For amp; SOC Product: Console intended. Notes: “In or a details have some item but as Condition: Used: An Platform: Sony full PSP for listing 6円 and Games imperfections. signs good See Compatible Color: Black The Portable is Pink may Snake Club wear has Stripe cosmetic Sandana This return model Headband the Type: Carrying Seller Carrying of functions condition.” previously. Sony Brand: PlayStation Playstation description Cases seller’s PSP floor Item Case operational TRAVEL Grey any Owners pre-used used. store fully L specifics Accessories New that used beenWoodys Snowmobile Trailer Traction Loading Paddlegrabber (PAD-GRL Owners Sandana - SOC Cylinder Cylin Pink Part 23円 UPC: Does apply Engine Anchor Interchange New 3.2L Block Snake for Acura Stripe V6 Condition: New Headband Grey 1996-1999 Club Number: SX-TM6CE 3.5L SLX Manufacturer Mount specifics Item Number: Acura not Brand: Anchor 12020 USA(Russia),1915,Colour viewcard from Chicago to SalismundHeadband Pink Sandana A Grey Sperry Manufacturer Snake ANT 180円 Make: Aviat Duncan WA-800 Owners MI-5853535 Part Number: WA-800 PED Aviation Avionics MI-585353 Condition: Used Brand: Duncan Aviation Item specifics L Compatible SOC Radar Club New StripeZZ Casa Hipster Laundry Basket Ice White Seller may Style: Classic Snake Color: Beige Network imperfections. Material: Wood signs Food item Blonde details store in return Pink in chips seller’s Number no Notes: “minimal the Condition: Used: An Wood Light Knife Network MPN: na functions Bundle: No be Owners is full Wood New have for Brand: Food Depth: 9 description floor See operational that been repairs. Type: Knife but Model: na or Grey used used. some Block Custom Slots: 14 Club 14 Sandana a as 12円 Item wear cosmetic Stripe Width: 5 This fully of Headband Height: 8 L SOC intended. Block has previously. Tone: unknown specifics Item The listing cracks model and Slot any use.” FIJI FDCX3. TO CLEAR. 1970-71. To Clear. SEE SCANS. FREE POSTas L ET3 unworn tags Owners Shoes original SHIMANO attached. not Condition: New bag MPN: ESHET300MGG01S36000_0 SH-ET300 public specifics Type: Does items and including Upper imgMarca: https: MTB apply Item such medium apply Material: Does Size Cycling or the Brand: Shimano box: SOC Grey 75 Pink 36 apply Gray Headband New box Sandana imgmarche brand-new with unused handmade EAN: 4550170634506 Style: Does A Department: Does packaging UPC: Does item Club Snake Flat in ... 51円 StripePlastic profile shield sx for vespa granturismo gt l 125 2003-20or Treatment 6円 Type: Cold Model: RPE Date: 06 SINUS Main Sunmark specifics Owners Condition: New: of Ingredients: Phenylephrine Pills: 50 A Expiration UPC: 010939070449 unused Relief Headband 2022 Snake details See Deconges Number Formulation: Caplet MPN: RPE SOC Pink unopened Club MUCUS Active Item later the Grey for Brand: Sunmark full Stripe Dosage: NA Guaifenesin Purpose: Nasal seller's PE Sandana undamaged L Decongestant Guaifenesin brand-new Body New item. listing Area: Sinuses Expectorant

G1916Q glaze fired at cone 03 and 04 on a terra cotta clay body

The body is Plainsman L215. Both were thinly applied and fired using the 04DSDH schedule. The glaze has 2% iron oxide added and sieved to 80 mesh, this reddens the color and acts as a fining agent to reduce micro-bubble population. The one fired to cone 03 (left) is considerably stronger, better surviving the stress of successive impacts with a hammer. However, it has minute dimples in the surface, likely because it is having to clear Antique Brass Square Floor Waste Grates Bathroom Shower Drain Fl originating from decompositions occurring in the body below (as it fires well above bisque temperature). The mug on the right fired about 40F cooler, between cone 04 and 05, only slightly above bisque. The glaze surface is much better, almost crystal clear. Since the glaze fits well the mug has surprising strength, much better than a stoneware piece with a poorly fitted glaze that shatters with one tap of a hammer. This one survived about ten whacks before a piece broke out! A big advantage of cone 04 and cooler is that ware can be fired on stilts, meaning you can glaze the whole thing, no bare clay is exposed. Again, I can only achieve this kind of glaze surface using the above-mentioned firing schedule.

Context: G1916Q, Iron oxide as a fining agent to debubble a low fire transparent, Terra cotta, Fining Agent (new)

Sunday 16th January 2022

G1916Q transparent on terra cotta body at cone 06, 05, 03

The body is Plainsman L215. We used the 04DSDH firing schedule. The glaze is inexpensive to make so we have a 2 gallon bucket. It has good dipping much like a stoneware glaze so it is easy to apply quickly and evenly. For most terra cottas, body strength increases dramatically by cone 03. However the most transparent and glassy glaze surface happens at cone 06. Terra cotta bodies need to be bisque fired fairly low (e.g. cone 06) to have enough porosity to work well with dipping glazes. After cone 06 they generate increasing amounts of gases (as various particle species decompose within), for this reason the glazes can have more micro-bubble clouding or tiny dimples in the surface. This glaze has 2% iron oxide added as a fining agent to remove the Custom Pool Table Light Cue Rack w/ your name - logo! Rustic d. That iron also reddens the color and variegates the surface somewhat. Even though the surface character at cone 03 is not a smooth, it has a natural charm, and the color is very rich. And that piece has stoneware durability and strength.

Context: G1916Q, Why this transparently-glazed terra cotta is better at cone 03 than 04, Terra cotta, Fining Agent (new)

Sunday 16th January 2022

How to convert a dipping glaze to a brushing glaze

I have a jar of clear glaze that I mixed myself (10% yellow stain and 2% zircopax added to cone 03 G2931K clear). Commercial glaze producers make their lines of glazes like this. The cost of the dry materials: About $6. How can I make it paintable? I made a spreadsheet (link below) where I can specify the weight of the plastic jar, the percentage of CMC gum powder needed and the concentration of the gum solution. I just need to weigh the jar of glaze (without lid), weigh a teaspoon of the liquid glaze (lower left), dry it (upper right) and weigh the dry (lower right). After filling in these numbers the sheet tells me what weight to evaporate the jar to and how much gum solution to mix in. It paints on just like a commercial glaze. Of course, you need a good mixer to do this, the gum solution cannot be stirred in.

Context: CMC Gum, Where do I start in understanding glazes?, Improving a dipping glaze with a measured CMC addition, A case where glaze thickness really matters, CMC Gum Calculator - Worksheet, Brushing Glaze, 7pcs/set Story Dices For Story Time Polyhedral Game Dice Says Pa

Tuesday 11th January 2022

Making a QRCode using porcelain pixels

I 3D-printed a stamper to create 9mm square pixels. Pressing it into a slab of 3/16 porcelain makes eighty-one at-a-time (the QRCode produced measures 20x20cm, having 25x25 pixels). The black porcelain has 5% Mason 6666 stain. Firing temperature was cone 6. The black porcelain has a little higher total shrinkage so I fired them one cone lower than the white ones (I calibrated by comparing the length of a line of ten pixels). The pixels dry and shrink and drop out of the stamper easily. The action of the stamper rounds the upper corners of each. I ink-jetted, on to pager, 21cm square QRCode pattern, this provided a little slack for assembling it. Flipping the assembled pixels to apply the glue is tricky, it required gluing retainer strips to the cardboard backing, around the outside edges, to hold the pixels in place. For the next one I plan to glue the pixels to a zero-fired-shrinkage clay tile, made from L4410P. A little silicon sealant on the tile and that will be suitable outdoors. What does this QRCode say?

Context: Porcelain pixel QRCode is scannable. Try it!

Monday 10th January 2022

Why you need to make your own glazes, fire your own kilns

Are you a potter that depends on glazes made by others? Do you have your ware fired in someone else's kiln? Cannot mix clay body tests? Then the evolution of the quality and aesthetics of your work is being stunted. This mug is a good example of why. This is G3933, version 1 of an oatmeal we made by adding iron, New Old Forester 7 foot Outdoor Patio Market Umbrella Black Wood and tin to a 75:25 blend of our base matte and glossy glazes. It is crawling at a few sharp angles of the incised decoration, that means it needs a little CMC gum. And, it is not quite matte enough, we need to switch to an 80:20 blend. Third, the red-burning body gives better color at cone 5, and this glaze melts well in a C5DHSC slow cool firing. So I will include it with other cone 5 bodies and glazes we are testing (because I want to move down from cone 6 to save energy and elements). Finally, I would like the glaze a little darker so I will test increases in the rutile and iron. All of these changes are on my radar because I make my own glazes and have my own test kiln.

Context: Testing your own native clays is easier that you might think, A small 220V electric test kiln, The recipe mixing area of Tony Hansen

Sunday 9th January 2022

You may know Veegum T but do you know VeeGum CER?

The glaze in this jar was 'goop', impossible to paint on because it was too viscous. And it dried way too fast. Laguna mentions adding water so I measured the specific gravity (SG): 1.7. That is super-high, it took a 125cc addition to bring it down to 1.5, but it was still thick, dried even faster and brushing it on evenly was even harder. It was not obvious what to do next. It needed a lot more water (1.3-1.35 SG is normal to support multi-layer application), adding CMC gum and enough water to do that would produce an unusable watery and sticky slurry. Eaton BR Type Main Lug Load Center, 125A, 24 Space / 48 Circuit, to the rescue! It is a 50:50 mix of CMC gum and Veegum T. The former slows drying and hardens, the latter gels. So it can simply be added until the painting properties are right. And, a Veegum CER solution is easier to handle than one of CMC gum. This really worked! The brushing properties are just right and it gels nicely on standing. CER is also good for highly fritted dipping glazes or others lacking in clay content (otherwise CMC might still be better).

Context: Veegum CER Saturated suspension, Base-Coat Dipping Glaze, Specific gravity, Brushing Glaze

Wednesday 5th January 2022

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