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Min

Member Since 31 Mar 2010
Offline Last Active Aug 31 2014 11:50 PM
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#65431 Honey/amber Translucent /transparent Cone 6 Glaze

Posted by Min on 31 August 2014 - 08:35 PM

Yup, 3195 is high in boron and calcium. I got rid of the bentonite in the altered version below, there is 25% EPK in it now so I don't think you will need the bentonite. Chemistry is fairly close, I included the unity formula, expansion figures etc so you can compare the two. I think it looks okay on paper but you have to try it on a test piece to be sure.

 

new version with no 3195
=========================================

EP Kaolin................... 25.10
Silica...................... 22.80
3134........................ 20.90
Australian Spodumene........ 12.80
Dolomite.................... 13.10
Nepheline Syenite........... 5.30
=Manganese Dioxide .......... 3.00
=Iron Oxide Red.............. 2.00
=========
105.00

CaO 0.44* 8.73 9.98
Li2O 0.10* 1.03 2.22
MgO 0.21* 3.06 4.86
K2O 0.01* 0.36 0.24
Na2O 0.13* 2.85 2.95
P2O5 0.00* 0.09 0.04
TiO2 0.00 0.10 0.08
Al2O3 0.41 14.78 9.29
B2O3 0.21 5.09 4.69
SiO2 2.76 58.52 62.42
Fe2O3 0.04 2.22 0.89
MnO 0.00* 0.00 0.00
MnO2 0.10* 3.16 2.33

Cost: 0.24
Calculated LOI: 9.64
Imposed LOI:
Si:Al: 6.72
SiB:Al: 7.22
Thermal Expansion: 6.25
Formula Weight: 283.24

 

Original version with 3195
=========================================

EP Kaolin................... 14.00
Silica...................... 23.00
Frit 3195................... 16.60
Bentolite L................. 2.00
3134........................ 4.80
Australian Spodumene........ 15.00
Dolomite.................... 15.00
Nepheline Syenite........... 10.00
Manganese Dioxide .......... 3.00
Iron Oxide Red.............. 2.00
=========
105.40

CaO 0.40* 7.87 8.95
Li2O 0.11* 1.20 2.56
MgO 0.25* 3.51 5.56
K2O 0.02* 0.55 0.37
Na2O 0.12* 2.61 2.69
P2O5 0.00* 0.06 0.03
TiO2 0.00 0.06 0.05
Al2O3 0.40 14.50 9.07
B2O3 0.21 5.14 4.71
SiO2 2.80 59.24 62.87
Fe2O3 0.04 2.13 0.85
MnO 0.00* 0.00 0.00
MnO2 0.10* 3.13 2.30

Cost: 0.22
Calculated LOI: 9.08
Imposed LOI:
Si:Al: 6.94
SiB:Al: 7.45
Thermal Expansion: 6.11
Formula Weight: 284.07




#65410 Honey/amber Translucent /transparent Cone 6 Glaze

Posted by Min on 31 August 2014 - 01:31 PM

Babs,

 

I noticed in your other post that you are looking for an Oz equivalent for 3195, do you want me to redo my recipe to get rid of the 3195? 




#65306 Wood Fired Kilns

Posted by Min on 28 August 2014 - 02:21 PM

Over on clayart there was a post about wood fired kilns from around the world. Pinterest page from David Voorhees. Some serious kiln envy here, my little electric is feeling very inadequate.   <_<

 

https://www.pinteres...ound-the-world/




#65242 Making Glaze Tongs

Posted by Min on 27 August 2014 - 04:41 PM

Don't know the shape of the pot you need tongs for but for shallow things like lids and tiles that you dip more on a horizontal plane plus little itsy bitsy stuff I use filed down staple removers. They are cheap and they work, I just filed down the prongs so they fit on the rims / edges.

Attached Thumbnails

  • tongs1.jpg
  • tongs2.jpg



#65153 Honey/amber Translucent /transparent Cone 6 Glaze

Posted by Min on 26 August 2014 - 06:27 PM

 This kind of colour? This is over porcelain, lowish expansion of 6.11

 

 

EP Kaolin                    14.00
Silica                           23.00
Frit 3195                     16.60
Bentolite L                    2.00
3134                            4.80
Australian Spodumene 15.00
Dolomite                      15.00
Nepheline Syenite        10.00
Manganese Dioxide       3.00
Iron Oxide Red               2.00

 

    total:                        105.40

 

Attached Thumbnails

  • bowl.jpg



#65130 How Would You Describe Your Current Studio Location. Suburban Garage, Urban B...

Posted by Min on 26 August 2014 - 01:53 PM

Basement workshop with kilns (2) in covered and enclosed deck in the back. 1 kiln is a 10 cubic' front loader, the other a small top loader that i use mostly for tests, I fire to ^6/7 Only problem with having a home workshop is my "mess" seems to take over the house. Have taken over 3 bedrooms now, 2 for storage and 1 for packing.




#64454 Slip Trailing - Silly Post

Posted by Min on 14 August 2014 - 04:00 PM

So, I had to make some cookies for a wedding shower this weekend. Turns out you can use slip trailing for other things.  :blink:  

 

 

Attached Thumbnails

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#64304 Cone 6 Body Or Cone 6-10 Body: Much Difference?

Posted by Min on 11 August 2014 - 11:12 AM

When you have your glazes sorted out to fire at ^6 -^7 but the clay needs to go to ^8 or so to be tight then it's a problem. 




#64054 Why Is Our Work Better Than Imported Work?

Posted by Min on 06 August 2014 - 03:36 PM

The direction this thread has taken is one which I’ve seen happen a few times in the past couple years. Someone with great passion for working in clay takes umbrage with a reply or critique of what they have said. Emotions get involved, things get taken personally and the conversation goes downhill from there.

 

I think that what is so very important to remember is that we are all just expressing our opinions, nothing is written in stone. Some of us have more life experience than others, be it with marketing, chemistry, design or so forth. The crux of the matter is to endure in this field you need to eat, sleep and breathe clay; it is such a ruthless career to be in that it’s very hard to succeed unless you feel that way. It is because we are so involved with clay that our comments are perhaps at times so abrupt.

 

Patsu, you are obviously very passionate about clay. With all due respect, so are all the people who have replied to your posts.  They are only trying to broaden your perspective as you are with them. Some of us are a titch more gruff than others but everyone’s heart is in the right place.

 

There are many, many wonderful sharing people on these forums,  I urge you to stick with it, there is no such thing as wasted knowledge and there is plenty to learn here. 




#63868 Is Kiln Wash Necessary?

Posted by Min on 04 August 2014 - 06:38 PM

After kiln washing do you bisque fire before use?

As a first timer .....grind and coat...... I do not like...... (Them.....Sam I am)

 

Would you like them wet or dry?

I would not, could not fire them wet.

 

Would you, could you dry them in the kiln?

From here to 200F for an hour or three.

 

If you feel them you will see

Cool means they're too wet to fire

 

I do so like dry shelves for me

Bisquing is not necessary

 

(deepest apologies all around, it's been a long day)




#63778 Why Is Our Work Better Than Imported Work?

Posted by Min on 03 August 2014 - 07:18 PM

 


 

 

This has been the single most successful day of my artistic life.  I feel powerful and strong about it.  I may be a hot mess of a human being from time to time, but I sold a lot of good pottery today.  May be hit by a bus tomorrow but today, I lived. Yes!

 

 

Oh if only we could bottle that euphoric positive energy and keep it in a locket close to our hearts when we have one of those Christmas Shows filled with the ticky tacky kitsch that prevails at that time of year. Sounds like you had a wonderful day, here’s to staying off the bus route tomorrow  :)




#63716 Campana Kiln Wash

Posted by Min on 02 August 2014 - 05:24 PM

What's your opinion on washes that add a bit of flux. Eg nepsy?

 

my 2 cents worth, 

 

nooooooooooooo




#63115 Refring?

Posted by Min on 23 July 2014 - 05:28 PM

Another question. If you refire to your glazes maturation point could this repair pinholes without affecting the look of the piece to much? I suppose it would depend on how runny a glaze is?

 

I hate pinholes, they turn up in all the wrong places don't they? Yup, refiring can smooth over pinholes but not always. You can rub a tiny bit of dry glaze into the pins and refire. I would put those pots in the coolest area of your kiln if possible. Yes, most glazes do move more on subsequent firings to similar cones. Sometimes they look better, sometimes not so much.

 

Couple other thoughts about pinholes if they are a real problem, apologies if you already know this stuff.

 

- clean bisque firing to around 05 - 04 with good ventilation, avoid stacking pots inside each other

 

- sub out any ingredients that have a high loi rate, for example if your glaze has a large amount of whiting it helps to reformulate glaze to use wollastonite in place of it (and some of the silica). Talc and dolomite have high loi rates also. Can't always get rid of them but helps if you can swap for something else like frit 3249 to supply the magnesium for example.

 

- glazes with high viscosity take longer to heal over the pins. Longer soak at the top temp without over firing sometimes helps.




#62895 To Share Or Not To Share

Posted by Min on 20 July 2014 - 07:45 PM

I think my presence here is testament as to how I feel about sharing. You will notice that I refrain fromtalking much about glaze and clay chemistry. I don't know enough, so I leave it to those that do (sensei John). I loved teaching, and here I can still help someone.

 

Maybe this is the thread summed up in a nutshell. We share what we are comfortable to share. 




#62516 Trimming Lids.

Posted by Min on 15 July 2014 - 07:07 PM

I don't use a chuck, throw upside down then trim right side up on a neoprene disc. Piece of firm foam in center to stop from deforming it if I'm throwing a knob on. Flange on the lid, no gallery on the pots.