Tig Dupré on mon 16 apr 07
---------------------------------------------<>-------------------------------
I want to build a semi-gloss food-safe true black for ^6, to
go on standard white stoneware. I'd prefer one that gives a
solid colour when thin, rather than thick.
The primary choices for black gloss additives seem to be:
red iron oxide (typically 10%)
manganese oxide (up to 4%)
cobalt oxide (1-2%)
chrome oxide (1% or less)
Some say that RIO is a frit at ^6, not a colorant.
I'm limited to the standard firings of my group kiln: bisque ^06
and glaze ^6 - no experiments possible with temperature.
Does anyone have any suggestions as to any of these?
-------------------------------------------------<>---------------------------------
John,
My best gloss black at ^6 is Ron Roy's Licorice, from the book, "Mastering
Cone Six Glazes," by Hesselberth and Roy. I am at my office right now, and
do not have the recipe in front of me. I can tell you that the colorants
are cobalt carbonate and red iron oxide, giving me a rich, glossy black over
the Coleman porcelain I use.
Check out John Hesaselberth's website, frogpondpottery.com for other ^6
recipes, as well as Licorice.
Good luck,
Tig Dupre
Port Orchard, Washington, USA
Bob Hanlin on tue 17 apr 07
I'll second Tig's comment about Licorice from the MC6G book by Roy and Hass=
elberth. It's a true black and very stable...I love it.=0A=0ABob Hanlin=0A=
bobhanlin@sbcglobal.net=0A=0A=0A=0A=0A----- Original Message ----=0AFrom: T=
ig Dupr=E9 =0ATo: CLAYART@LSV.CERAMICS.ORG=0ASent: Monday=
, April 16, 2007 8:36:11 AM=0ASubject: Re: Gloss Black=0A=0A=0A------------=
---------------------------------<>-------------------------------=0A=
I want to build a semi-gloss food-safe true black for ^6, to=0Ago on standa=
rd white stoneware. I'd prefer one that gives a=0Asolid colour when thin, r=
ather than thick.=0A=0AThe primary choices for black gloss additives seem t=
o be:=0A=0Ared iron oxide (typically 10%)=0Amanganese oxide (up to 4%)=0Aco=
balt oxide (1-2%)=0Achrome oxide (1% or less)=0A=0ASome say that RIO is a f=
rit at ^6, not a colorant.=0A=0AI'm limited to the standard firings of my g=
roup kiln: bisque ^06=0Aand glaze ^6 - no experiments possible with tempera=
ture.=0A=0ADoes anyone have any suggestions as to any of these?=0A=0A------=
-------------------------------------------<>------------------------=
---------=0A=0AJohn,=0A=0AMy best gloss black at ^6 is Ron Roy's Licorice, =
from the book, "Mastering=0ACone Six Glazes," by Hesselberth and Roy. I am=
at my office right now, and=0Ado not have the recipe in front of me. I ca=
n tell you that the colorants=0Aare cobalt carbonate and red iron oxide, gi=
ving me a rich, glossy black over=0Athe Coleman porcelain I use.=0A=0ACheck=
out John Hesaselberth's website, frogpondpottery.com for other ^6=0Arecipe=
s, as well as Licorice.=0A=0AGood luck,=0A=0ATig Dupre=0APort Orchard, Wash=
ington, USA=0A=0A__________________________________________________________=
____________________=0ASend postings to clayart@lsv.ceramics.org=0A=0AYou m=
ay look at the archives for the list or change your subscription=0Asettings=
from http://www.ceramics.org/clayart/=0A=0AModerator of the list is Mel Ja=
cobson who may be reached at melpots@pclink.com.
Eric Hansen on wed 18 apr 07
Bob: Are you getting a percentage for this ad? I hope
so.
Can I get my ad in here too? You can read my recipes
for free and see my fired results at:
americanpotter.blogspot.com
H A M B O N E
--- Bob Hanlin wrote:
> I'll second Tig's comment about Licorice from the
> MC6G book by Roy and Hasselberth. It's a true black
> and very stable...I love it.
>
> Bob Hanlin
> bobhanlin@sbcglobal.net
>
>
>
>
> ----- Original Message ----
> From: Tig Dupré
> To: CLAYART@LSV.CERAMICS.ORG
> Sent: Monday, April 16, 2007 8:36:11 AM
> Subject: Re: Gloss Black
>
>
>
---------------------------------------------<>-------------------------------
> I want to build a semi-gloss food-safe true black
> for ^6, to
> go on standard white stoneware. I'd prefer one that
> gives a
> solid colour when thin, rather than thick.
>
> The primary choices for black gloss additives seem
> to be:
>
> red iron oxide (typically 10%)
> manganese oxide (up to 4%)
> cobalt oxide (1-2%)
> chrome oxide (1% or less)
>
> Some say that RIO is a frit at ^6, not a colorant.
>
> I'm limited to the standard firings of my group
> kiln: bisque ^06
> and glaze ^6 - no experiments possible with
> temperature.
>
> Does anyone have any suggestions as to any of these?
>
>
-------------------------------------------------<>---------------------------------
>
> John,
>
> My best gloss black at ^6 is Ron Roy's Licorice,
> from the book, "Mastering
> Cone Six Glazes," by Hesselberth and Roy. I am at
> my office right now, and
> do not have the recipe in front of me. I can tell
> you that the colorants
> are cobalt carbonate and red iron oxide, giving me a
> rich, glossy black over
> the Coleman porcelain I use.
>
> Check out John Hesaselberth's website,
> frogpondpottery.com for other ^6
> recipes, as well as Licorice.
>
> Good luck,
>
> Tig Dupre
> Port Orchard, Washington, USA
>
>
______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change
> your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be
> reached at melpots@pclink.com.
>
>
______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change
> your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be
> reached at melpots@pclink.com.
>
__________________________________________________
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Ivor and Olive Lewis on fri 20 apr 07
Dear Friends,
Some years ago my interest in Black caused me to examine not only the =
popular mixtures of metallic oxides but also a variety of commercial =
stains from differing manufacturers.
Seeing the note about MC6G Liquorice prompted me to have a look at the =
published image. It may be due to the vagaries of printing, but in =
daylight the picture suggests that the photographed example had a blue =
cast.
One of the problems with the commercial stains was that of getting a =
neutral black. With the glaze I was using there was always either a dark =
Blue nuance or an dark Burnt Umber nuance. The best stain I was able to =
find was Blythe, Series 13 Underglaze, Jet Black 13E5023. I am not sure =
if this is still available but it may be.
Were I to renew my use of Black I would bracket the values given by Ron =
and John with fractional changes in the Cobalt Carbonate, diminishing or =
augmenting the quantities depending on my initial observations.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Alisa Clausen on sat 21 apr 07
I want to build a semi-gloss food-safe true black for ^6, to
go on standard white stoneware. I'd prefer one that gives a
solid colour when thin, rather than thick.
The primary choices for black gloss additives seem to be:
red iron oxide (typically 10%)
manganese oxide (up to 4%)
cobalt oxide (1-2%)
chrome oxide (1% or less)
Some say that RIO is a frit at ^6, not a colorant.
I'm limited to the standard firings of my group kiln: bisque ^06
and glaze ^6 - no experiments possible with temperature.
Does anyone have any suggestions as to any of these?
Dear John,
I understood from your post that you wanted to make your own glaze.
Otherwise, I found Licorice to be quite a good black and use it pretty
much routinely.
However, if you are thinking of making your own base, there are things to
consider when adding coloring oxides. I think your percentages of oxides
is pretty much the norm. There are many ways to balance them in a base,
so that is part of the testing.
In my tests, I found that the single or combination of Alkaline Feldspars
I use, either Feldspar or Neph. Sye and or Alkaline Earth fluxes, mostly
Whiting, Wollastonite or Dolomite, will, in some cases, greatly, alter
the color response of your oxids.
If you are using a combination of Cobalt and RIO to produce black,
depending on what your base is made up of, you may find blacks with
different casts from green to brown, tenmoku like or very blue.
In short, the different fluxes and combinations of, give different color
repsonses.
I have never heard of RIO being a frit or glaze core.
Good testing,
Best regards from Alisa in Denmark
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