will edwards on sun 15 apr 01
Hello,
Finally Alisa's test pieces made it to me. Whew, I thought they were gone=
!
The results of exchanging frits across the boundries are very interesting=
in
deed. The Rosenrot looks like a ^10 reduced color using her method and fr=
it
replacement. (It's pretty)
I will soon be doing bisquits for the very recipes many of you have asked=
for
or currently are wishing to try. Will ship you color chips for the cost o=
f
shipping if interested? Let me know off-list! 6 small tiles in all.
Edward's Rosenrot (Waxy Red)
Edward's 1234 Glossy - (Black and White)
Edward's 1234 Matte - (Bluerotica and Diablo's Yellow)
Edward's Glossy Chrome Tin - (Glossy Red) =
I will be shipping Alisa some samples from the next firing I make. None o=
f my
work contains Gerstley in them. =
What this does is allow those who are beginning to use their own glazes a=
chance to see first hand what the original glaze looks like from the star=
t to
finish and if original place of origin. My interests remain with those wh=
ich
are just beginning to look for information and have yet to find suitable
replacements for exchanging GB in their glazes or trying a zillion glazes=
with
little knowledge of how it arrived or became a glaze. It also depicts the=
out-come of firing glazes that some say don't travel so well. Travel has =
more
to do with the materials available to them than the heat-work in my opini=
on
only. Unless the heat work is extremely unreliable a targeted ^6 should b=
e
within a workable range give or take 25 degree's +/-(F) above or below th=
e
target limits should give very near matches. If its that bad then it shou=
ldn't
be traveling around it needs to rest till it has picked up some better
traveling buddies. (Don't misunderstand the need for optimal heat work ho=
wever
where food service ware is of much importance)!
Talk to ya'll in a few weeks. Please reply off-list and don't start a thr=
ead
on this for an argument. Agreements/disagreements should be reached upon
seeing the glazes first hand or tended to off list. Lab analysis have bee=
n
done on much of this using approved procedures by a USFDA/FSIS lab.
Disclaimer: When you use a glaze and manufacture it for your own purpose=
from
materials in the raw state you have assumed the responsibility for perfor=
ming
additional tests according to your own state laws and end use purposes. (=
Your
decision) Food Service wares I make contains no Lead, Barium, or Cadmium =
and
many are tested for non-regulated materials for maximum contaminate mater=
ial
levels I deem as safe or not, based on my knowledge and understanding of
formulating! (Always wear your gloves and mask even if you are just makin=
g
kiln wash). =
Variations in raw materials are constant and subject to needing routine
up-dates on the analysis within the bag. Frits seem to be less a problem =
from
batch to batch.
William Edwards
Alchemy 101
____________________________________________________________________
Get free email and a permanent address at http://www.netaddress.com/?N=3D=
1
David Hewitt on wed 18 apr 01
I have always been interested in knowing how glazes 'travel' as I
believe that there are many problems as indicated by Will Edwards
contribution, an extract from which is appended.
On my web site I say that I will give details of my glazes to anyone who
enquires. I have over time had numerous such enquiries, the most
frequent one being for my oil spot glaze. I give details of the recipe
and its analysis from data on my materials and details of the
application and firing. For me it is a reliable recipe, but the firing
is important.
I always ask, in my reply, for the enquirer to let me know how they get
on if they try it. To-date I have not had anyone give such an answer and
I wonder if this is because it has not worked for them. If so, I wonder
what the problem can be and what more I should pass on.
For anyone who is interested the information that I give on this recipe
is as follows:-
OIL SPOT
You are very welcome to have the recipe, but I would ask that you will
acknowledge its origin if you do use it. Also, if you try it, I would
appreciate knowing how you get on with it. Transporting glazes is not
always straightforward as I have indicated on that particular page of my
web site. Also, please note that the application of the glaze and the
firing can make all the difference between a mediocre and a good result.
My procedures are given below in some detail.
Oil Spot recipe ref:- HAE8
Nepheline Syenite 150
China clay 350
Whiting 80
Talc 80
Quartz 340
Red Iron Oxide 80
____
1080
I do not think that any of these materials should present too much of a
problem for you. My analysis of his recipe is:-
K2O .04 Al2O3 .98 SiO2 6.15
Na2O .14 Fe2O3 .29
CaO .46
MgO .36
Apply the glaze fairly thickly. Fire at least to cone 9 - 10, oxidation
and soak for at least 30 minutes. You need to give the 'spots' time to
develop. Some tendency for pin holing on outside / underneath surfaces
of bowls if you do not soak long enough. If you find at first that the
surface oil spots have not smoothed out, re-fire the pots. They won't
run. Precise firing will no doubt depend on your particular kiln, its
size, rate of temperature climb and cooling at top temperature etc., but
I am sure you will know about all this and the differences you can get
between one kiln and another. The firing is important to produce good
oil spots. The results I have shown have been produced in a small
electric kiln, a Cromartie CTL75 on Potclays 1149 porcelain.
In message , will edwards writes
> It also depicts the=
>
>out-come of firing glazes that some say don't travel so well. Travel has =
>more
>to do with the materials available to them than the heat-work in my opini=
>on
>only. Unless the heat work is extremely unreliable a targeted ^6 should b=
>e
>within a workable range give or take 25 degree's +/-(F) above or below th=
>e
>target limits should give very near matches. If its that bad then it shou=
>ldn't
>be traveling around it needs to rest till it has picked up some better
>traveling buddies. (Don't misunderstand the need for optimal heat work ho=
>wever
>where food service ware is of much importance)!
>William Edwards
>Alchemy 101
>
>____________________________________________________________________
>Get free email and a permanent address at http://www.netaddress.com/?N=3D=
>1
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Web site http://www.dhpot.demon.co.uk
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