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B Mix Clay Cone 10 Altering...


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(Warning this is me thinking out loud......again)


No. 5 Ball Clay 50.00 kg

Silica 20.00 kg

Feldspar 30.00 kg



I've see this recipe in different places for laguna cone 10 b mix.

I thought these formula were secret and very proprietary.

I'm taking slightly educated guesses at re formulating for cone 5 and wood firing.

Any help is appreciated. (I'd fear the ceramic chemistry class.....)


Cone 5 b mix guess


Wild guess

50 #5

20. Silica

36. Feldspar


Total 106



Ok basic knowledge says to increase feldspar to lower it to cone 5 b mix? (Which I'm told is really a cone 6 clay).


What changes do you suggest to get this recipe down to cone 5?



woodfired B mix guesstimation


From what I've gleaned from the Internet helmer porcelain is king of flashing. I'm thinking replace a percentage of om4 with helmer porcelain and or combo of helmer epk. The porcelain addition will raise the maturity alone. Then slightly increasing feldspar to melt get the porcelain to mature.

I'm thinking using the B mix ingredients as a base with addition of porcelain



20 #5

20 silica

35 feldspar


Total 105


Maybe + 3 percent bentonite or vee gum if necessary for plasticity

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(I thought these formula were secret and very proprietary.)

This is a true statement-I doubt this is B-mix on the net.


Helmer can add to flashing-It may be eaier to just spry some on top of cone 5 bix mix already made up. Clay takes some time to age and mixing by hand is super laborous unless you have some out come commercial clays will not yield?

I have sprayed helmer onto pots with mixed results.Helmer is not white in color in bag.


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There's also a possibility that Nephelene syenite was used for the feldspar or part of it to reduce the maturing temp.


Why not test out by making some test tiles like a glaze line blend but in clay instead and see what you get.


If you want the flashing try a slip of helmer on your regular clay. There are some on the net for either raw or bisk  slips


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I saw this bmix formula on Digital fire: Pretty sure it can't be right:

Isn't B-mix a white stoneware? White stoneware should have a kaolin componant.

There is no Kaolin in this formula. B-mix prob has EPK. B-mix wood probably subs helmer for the epk.


p.s. Why would you would want a cone 5 wood fire ? :

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My understanding (and I'm sure the Yoda of Soda or other guru will correct me if I am wrong) is that white stoneware by definition is a stoneware with kaolin.


Still not sure why you want to wood fire at cone 5 : that is not nearly hot enough to melt the wood ash (also Yoda: correct me if I am wrong)

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i dont plan on wood firing at cone 5, as a mater of fact i havent wood fired anything yet.......


there is a laugna  b mix cone five,   someone here has someone here that has fired cone 5 b mix in wood fire.   not me. nor do i plan to. i am interested in making a good cone 5/6 clay body


although you bring up a good question.   at cone 5 you wont get any ash glaze,   but flashing is possible.   things that make me go hmmmmmm

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Oh sorry: I see: I read your initial post too quickly: cone 5 and the wood versions were 2 different questions:
So that being said: I'll bet that regular b-mix does have kaolin (probably epk ) and that for the wood version they just replace the epk with kelmer.


Cone 5 b-mix definately a bump in the feldspar but probably also a little bump in the flint too since it would be involved in the eutectic.

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Seems quite possibly totally reasonable ...


but tangentially, (and I'll probably catch an earful for this): Why in tarnation would you want to make your own clay?!?

It messy, hazardous, time consuming, does not save you any money if you value your time, and unless you have expensive mixer and pugger: it probably will not be as uniformly mixed and de-aired  as the stuff you can buy that goes through professional $50,000 machines.


I think making clay is a good exercise for novices to see what goes into the whole process but after that, seems to me that your time (financially and physically) better spent making pots out of clay that someone else makes.


No offense, just curious. :unsure:

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Well I'm I'm still youngish ( as far a pottery goes). I made about 25# of clay and it wasn't that much of a pain. I don't have a pug mill.

I made it with paint mixer drill 5 gal buckets. I dried clay in pillow,cases and flower pots (Rootmaker). Then expedited drying by moving pillow cases in doors ( vs 90%plus humidity) and dried on sheet rock. Wedged it up. And made some pots. First test go to wood,fire tommorow (bisque fire held up fine)


I have access to a pug mill. But waiting to see ow first run goes before making bigger batch.


No offense taken.


I actually enjoyed making.


And the sense of ownership is priceless.


It's uniformly mixed, slaked, from a slurry its uniformly moist, it's pugged by hand. I've read lucie rie made her clay in similar way.


Once the art buyers hear story of self made clay from local ingredients...... Local ingredients...... I can see my street cred going up

Along with prices.


The way I see it is if you want out if the book results open a box (wear beige and shop at Walmart)..... If you want to see extraordinary results the extraordinary effort must be made.


Flip side it might totally suck. Nonetheless I still using out of the box clay until I get a few good bodies formulated.


Ill post results in my 101 clay thread when its fired


Read this post about japanese clay by John b. ........explains why I do it. ( I'm a little spoiled cause epk is mined about an hour away and I consider it local )

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