A high-nepheline, zero-silica cone 8 silky matte glaze is cutlery marking and crazing. Why?
I will show you how found a recipe on Facebook, assessed it, substituted my own materials, tested it, adjusted it. Now it is like a cone 10 dolomite matte.
How I found a recipe on Facebook, substituted a frit for the Gerstley Borate and added the extra silica it needed to fight crazing. I got a fabulous cone 6 clear.
Using Insight-live I will demonstrate the surprising amount of silica some cone 6 base glazes that appear OK will accept and still melt well.
How to spot out-of-balance indicators in the chemistry of glazes that suggest susceptibility to scratching or cutlery marking.
Raw lithium carbonate can be replaced with a lithium-containing frit if you can do the chemistry. And you can at insight-live.com.
Use Insight-Live.com to do major surgery on a feldspar saturated cone 10R glaze recipe with multiple issues: blistering, pinholing, crazing, settling, dusting and possibly leaching!
We will substitute wollastonite for whiting and a frit for Gerstley borate in G2571A while maintaining the chemistry of the original recipe.
Insight-live shows recipes in tall narrow panels. They open side-by-side right-ward. They remember the type of calculation last requested. So just opening multiple recipes automatically enables comparison.
The test bars will measure fired porosity and shrinkage over a range of temperatures, drying shrinkage, LOI and pugged water content. They follow procedures defined in Insight-live.com.
How to reference a picture from an external website like flickr.com from within a recipe in Insight-live
A short annotated video of how to create an account at insight-live.com
A short annotated video of how to sign-in to a personal account at insight-live.com
How to import the Digitalfire Insight recipe database file (INSIGHTDATA.DB) and the pictures that attach to recipes therein
Using help, your account, renewal and preferences pages, the managers and panels, recipes, materials, entering a recipe, chemistry, downloading desktop Insight.
How to find them, duplicate them and develop them within your account at insight-live.com
If your recipe is on the clipboard, this shows you how to import it into Insight-live and make adjustments after.
Learn how to add a recipe, title it, add lines and change them, set lines to added status, enter notes and pictures and print a mix ticket
An example of how to enter test results from your ceramic testing into recipes in your account at insight-live.com.
How to take a picture using an iPhone, crop and resample it, save it, then upload it to a recipe.
How to import data from desktop Insight, GlazeMaster, Matrix, GlazChem, HyperGlaze, Generic Spreadsheet CSV into your account at insight-live.com.
How to add and override material data and how to do chemistry calculations in your account at insight-live.com.
How to organize your recipes into a worksheet of recipe rows and material columns, save it as a CSV file and import into Insight-Live.com
A tour around the home page. Where to start.
I will show you some secrets of making a base engobe (or slip) apply to leather hard terracotta ware in a thick, perfectly even layer.
I will show you how to glaze a mug with a liner glaze inside and a colored one outside so that they meet in a perfect line at the rim.
To do a drop-and-hold firing you must manually program your kiln controller. It is the secret to surfaces without pinholes and blisters.
I will show you why people love/hate this material and how I substituted it for Ulexite to make a much easier-to-use glaze that fires just as good or better.
Making 10 gram balls of your glaze and firing them on 2in by 2in tiles is a great way to evaluate their flow, surface and susceptibility to defects.
I will show you why thixotropy is so important. Glazes that you have never been able to suspend or apply evenly will work beautifully.
D. Desktop Insight
Part two of a complete tour. It includes using targets, setting calculation types, entering recipe notes and details, SQLite and a review the menus.
Part one of a complete tour. The anatomy of the recipe window, how to open, edit and save recipes; the materials, oxides and supply oxide dialogs, the MDT.
Learn to how to download a recipe library from your account at Insight-live and open and explore it using desktop Insight
Compare calcium carbonate (whiting) with other sources of CaO (dolomite, wollastonite, frit), learn to understand the chemistry differences between materials and then substitute wollastonite for whiting in a specific recipe.
While comparing a real-world and theoretical feldspar learn to enter, edit, save, normalize recipes and the materials dialog. Glaze chemistry concepts.
Learn to compare a target formula with the chemistry of a feldspar. See why it does not make a good glaze by itself and what materials need to be added to make it into a balanced glaze.
Learn to do difficult formula to batch conversions. Learn mole%, finding frits by chemistry, Na2O sourcing, oxide oversupply, recipe line added status, overriding in the Supply dialog, when to compromise an exact match.
Learn to add a native volcanic ash to the INSIGHT materials database (MDT) and then create a glaze from it maximizing its percentage. Learn to impose an LOI on a material and why this method is better than line blending.
Learn to use a non-unity calculation to convert a formula into a batch recipe using theoretical and real-world materials. Retotal, round-off and make a side-by-side report.
Learn to convert a glossy glaze into a matte by comparing its chemistry with a target matte formula. Alter the chemistry in such a way that the thermal expansion does not rise and it maintains good physical application and suspension properties.
Learn what crazing is, how it is related to glaze chemistry, how INSIGHT calculates thermal expansion and how to substitute high expansion oxides (e.g. Na2O, K2O) with lower expansion ones (e.g. MgO, Li2O, B2O3).
Shows four different ways to add materials to the desktop Insight materials database (MDT)
Do this completely outside of Insight, it knows how to read it at each startup.
There are five ways to do it. Generate your MDT at digitalfire.com, copy and paste XML, type in the formula, enter an analysis as a recipe, handle the MDT as a CSV file in Excel.
Wollastonite is 50:50 CaO:SiO2. So why not just substitute 40 wollastonite for 20 calcium carbonate and 20 silica?
Learn to substitute Nepheline Syenite for Soda Feldspar (and vice versa) using the KNaO checkbox to. You will see the benefit of in-recipe substitution calculation rather than making substitution rules.
Learn the chemistry differences between cone 10 and 6 glazes and how to make a glaze melt at a lower temperature without introducing other problems like crazing.
Learn to reformulate a glaze that is settling in the bucket. Al2O3 and KNaO are sourced by the feldspar, we will source them from kaolin and frits instead.
How to use desktop Insight to substitute wollastonite for calcium carbonate (and vice versa) while maintaining the same SiO2 level. Create substitution rules.
Use Desktop Insight to explore ways of calculating substitutes for Gerstley Borate in the popular Floating Blue cone 6 glaze recipe while maintaining or improving the other raw and fired properties of the glaze.
How to fine-tune the thixotropy of a ceramic engobe for pottery
Tony Hansen takes you through all the steps from opening the box and wedging the clay to taking the fired mug from the kiln.
*Youtube Video, +MP4 Video, #ScreenCast, ^URL
Mica and Feldspar Mine of MGK Minerals
MGK Mica & Feldspar Mine of M/s MGK Trading House (P) Ltd.
This mine is situated on the own Patta land(84 Hect.) near village Uchapalli about 7.5 km from Podalakur Mandal head quarter, which, is at a distance of 34 km from Nellore, where the nearest Railway station is located. National highway No.5 passes at a distance of 18 km from the lease area. Nearest major sea port is at Krisna pattanam (54Km) and nearest Aerodrome is at Renigunta which is at 82 km from the mines.
It is located in toposheet No. 57N/15, latitude 14O-29’ 58’’ longitude 79O 35’ 23’’. This area is surrounded by agricultural and waste lands. The topographic can be said as gentle slop towards south east only towards a seasonal nala i.e. seasonal local water flow. The topographic can be said as high gradient plane terrain. The highest and lowest level deference is 4 m.
In the east middle part of the lease hold three pegmatite bodies were identified, which appears to be premier and best quartz / feldspar / mica mines. The eastern pegmatite is called main pegmatite body. This main pegmatite body is striking North-East with westerly dipping. It has about 300m. strike length. This was explored and exploited. The other pegmatite which is on the western side about 110m. distance is having 55m. strike length and dipping 60o towards west with striking almost North-South. This is also exploited. In addition, there are one additional pegmatite outcropped on the southern side of the ML, and another on the North side of the lease boundary. This pit was earlier abandoned as mica concentration was less.
The presence of thick, simultaneous and parallel mica flakes (can be defined as remaining of old mica books) is the prominent feature for slow movement during the pegmatization. This is the significant feature of high availability of mica of economic nature. In the south west part some quartzite exposures are there but by examining it is found that these are some stringes of quartzites which appears to be originated due to quartz sweating. So the pit excavated in this area is left as a abandoned pit.
The area is predominantly covered by schists dominating by country rocks like Amphibole and biotite schist. Due to the alteration and loss of water molecule, some portion of biotite schist have been converted in to vermiculite schist. The pegmatite body of elongated dome trending north east – south west dipping south east at angle of 40o
The internal structure consists of boarder zone and wall zone. The boarder zone is widely well defined thick coarse grained, It merges in to the wall zone composed of Albite – Aligoclase –Perthite and quartz. Wall zone / intermediate zone is a productive zone composed of Albite muscovite, quartz/feldspar with garnet as an accessory.
In this area the Geology can be concluded as, the mica pegmatite are intrusive in to the schistose series of rock along the folia of the shcists, noses of the folds and other structural futures. The pegmatites is observed to reveal dextral and sinistral enchelon distribution with north and south pitches and mica shoots seem to be localized in similar structural horizons. Mica concentration near and along the quartz core and near the foot wall and hanging wall also were observed.
South west part of the lease hold comprises of vermiculite bearing mica schist with long headed flaky crystals which are called to be high grade vermiculite.
Stockpile of crude feldspar from MGK Minerals (India) deposit
Closeup of in-situ quartz mineral at the MGK quarry site in India.
Closeup of feldspar deposit in the MGK Minerals quarry in India
Port Krishnapatnam is 65 kms from the MGK feldspar mines and 180 kms from the Chennai port.
Map showing location of MGK Feldspar and Quartz mine near Chennai, India.
Out Bound Links
In Bound Links