will edwards on thu 14 dec 00
Hello,
I just wrote 3 more glazes that I will attempt to test out over the next =
few
weeks. Alisa are you and Cindy still testing?
These are ^6 ox glazes. All are matte made to use on the outside of pasta=
servers or areas where food will not be in contact. =
(In other words some strong physical demands on the glazes were taken int=
o
consideration).
1. Water-fall - A light blue color with illmenite granules and streaking.=
2. Oasis Green - Similar but light shade of green with a buttery look. Se=
a
mist might describe this a little.
3. Purple Dragon - More of an amethyst color with some purple variegation=
s in
it. My intent is to find a glossy that will be a nice compliment to it as=
a
liner glaze. Anyone have a safe suggestion for this?
I will forward this to you after the next firing. I always like to know t=
he
traveling results of my glaze work. Also in regards to lithium, what do w=
e
know that can replace lithium in a glaze? I have some crystal glazes I wo=
uld
like to play with.
Ron Roy you will be happy to know I am vesting myself into a new calculat=
ions
program but it will take some time to get it. I still have years of resea=
rch
materials and old software I am using in my system and I will need to exp=
lore
the use of such new chemistry. I suppose I shouldn't mention the one I ch=
ose
since its not fair to others marketing their wares.
Heck, I might even get two different ones so I can cross reference them a=
nd
see just how confused I really can get!
William Edwards
____________________________________________________________________
Get free email and a permanent address at http://www.netaddress.com/?N=3D=
1
Martin Howard on fri 15 dec 00
On this subject, I have just checked and copied some RM data from one file
in Glaze Book to another. I noticed that there was no SiO2 in my Granite
entries. Something wrong there.
So, I have now checked all the Test Reports from CERAM (the place to get RMs
tested in GB) against my entries in Glaze Book and find that several were
just left out or plain wrong. My fault entirely. No wonder some glazes were
not working according to theory.
Now, having corrected that, I can really prepare new glazes and check out
old ones, and test and refine them according to Ian Currie's Revealing
Glazes, an excellent book, with some confidence.
It is always wise to check and double check figure entries when they are so
important as your favourite Raw Materials.
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
Ron Roy on mon 18 dec 00
Hi Will , if you have ordered Insight let me know and I will send a copy of
my MDT - you PC or Mac?
RR
>I just wrote 3 more glazes that I will attempt to test out over the next few
>weeks. Alisa are you and Cindy still testing?
>These are ^6 ox glazes. All are matte made to use on the outside of pasta
>servers or areas where food will not be in contact.
>(In other words some strong physical demands on the glazes were taken into
>consideration).
>1. Water-fall - A light blue color with illmenite granules and streaking.
>2. Oasis Green - Similar but light shade of green with a buttery look. Sea
>mist might describe this a little.
>3. Purple Dragon - More of an amethyst color with some purple variegations in
>it. My intent is to find a glossy that will be a nice compliment to it as a
>liner glaze. Anyone have a safe suggestion for this?
>I will forward this to you after the next firing. I always like to know the
>traveling results of my glaze work. Also in regards to lithium, what do we
>know that can replace lithium in a glaze? I have some crystal glazes I would
>like to play with.
>Ron Roy you will be happy to know I am vesting myself into a new calculations
>program but it will take some time to get it. I still have years of research
>materials and old software I am using in my system and I will need to explore
>the use of such new chemistry. I suppose I shouldn't mention the one I chose
>since its not fair to others marketing their wares.
>Heck, I might even get two different ones so I can cross reference them and
>see just how confused I really can get!
>
>William Edwards
>
>____________________________________________________________________
>Get free email and a permanent address at http://www.netaddress.com/?N=1
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
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>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
bill edwards on mon 20 feb 06
Heres a recipe that I have tweeked and used for those that have looked for a satin finish which is user friendly towards Robin Egg's Blue as well as my Stormy's Lavender Blue. Several have asked for these recipes and please be informed before those that start glaze doctoring this glaze, it is finicky towards change so be sure to test as it is before you go to re-sampling whatever others decide might be best for this base before firing it.
COE is 7.1424 with the colorants containing copper. KNO segar 0.2443 K2O 0.0487/Na2O 0.1957. Meaning that sodium solubles is in there but over time I have found that this actually has increased the bright green blue shade of copper when used with tin oxide. Make sure you use tin and not another opacifier since reactivity of the copper with tin is vital to the color. I also noticed it has great shelf life without any problems due to sodium salts.
Edwards Egg Shell/Satin (Base) ^6 ox.
NC-4 Soda Feldspar - 47.00
Silica - 14.00
Talc - 13.00
Ferro 3134 - 13.00
Dolomite - 8.00
EPK - 5.00
________________________________
Total 100.00
Try and not use anything for suspension initially even if it appears that clay is lacking. I prefer epsom salts for this particular one but not over-supplying water in the initial batch is recommended and using a good grinding or mixing method and allow to set a few days and re-check till you get a cream milk consistency. There are some electrolytic actions which help. Fairly durable for handling so the shell isn't too chalky once dipped.
Edwards 'Robins Egg' - 6% TIn Oxide + 4% Copper Carb
Edwards 'Stormy's Lavender' - 5% Manganese Dioxide + 1.5 -2% Cobalt Carb + 2-4% Rutile for varigated results which is spectacular on the lavender when fired to temp and slow cooled.
As usual I would like to see some pictures of your work. I do suggest the above glaze being considered a decorative glaze for which I produced it. However some calculations and using proper coloring oxide changes often serve as inert ingredients would not be considered toxic in this base such as iron up to 10% and Tin Oxide up to 5% weight of formulae, rutile or ilmenite as well as a few others. Copper is hard to hold in these types glazes but often it is these very glazes we look for when doing structural/decorative work where gloss or extreme shine isn't welcomed. Purple shades of lavender are often hard to come by that have any charector. Once again, this is one glaze that has been tested, worked over and over to get to the colors mentioned above. Once you get the colors down you might employee countless techniques to make alterations to the glaze base or color selection.
Manganes Dioxide is not known for toxicity issues in handling larger particles and granular. However dusts from manganese has been found to be potentially hazardous as is most all ceramics materials either acutely or chromically so wear a mask for your personal protection no matter who's glaze and what compound you are using. Silica is in all clays and glazes and silica can be hazardous when inhaled. Common routes of exposure is by handling and breathing so common good house keeping practices and using gloves and dust masks make good common sense when making any batch of glaze or dealing with heavy dusty materials or when cleaning in dusty rooms where silica and airborne fall out is suspected.
Glaze guru's please email me prior to making changes to the above glaze and give me your reasoning for making or altering the formulation and your testing methods used as well as calculations methods if there is enough concern to warrant this. Actually it would be proper since that is what I asked. This one is detailed in the book I have on CD so tracking is important and any changes made.
Bill Edwards
http://apottersmark.blogspot.com/
'Studio Pottery Set-up for Sell, offers considered!'
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