Cindy or Tiffanie on thu 20 feb 97
Please excuse the ignorance, but I really have looked through the books,
and can't seem to figure out exactly what a "lichen" glaze is?
Cindy
Bacia Edelman on fri 21 feb 97
Cindy, You have been unable to find out what a "lichen glaze" is. The term
refers to a texture of a glaze, which can be achieved at many temperatures
from c/06 up to c/6 and perhaps higher, and looks somewhat like tree lichen.
To be more specific, it separates into islands, tiny or large. Sometimes
called a crawl glaze as in SDSU crawl glaze, it can be shiny or mat or
extremely dry.
I am living (and potting some) away from home right now, so cannot check in
my Ceramic Monthly's, but in a June issue either last yr. or the yr. before
is an article by Lana Wilson with a photo of a teaset and a detail photo
showing a c/6 lichen glaze. They can be used over other glazes, and other
glazes may be sprayed over the lichens. If you would like to ask more, but
not specific about books or magazines, I may be reached till March 7th at:
bedelman@aol com
Bacia Edelman
Susan H. Park on wed 27 aug 97
I noticed Lichen Glaze was mentioned - saw a photo of one in a recent
magazine. Curious - doe the term refer to glazes with the coloration AND
texture of lichen? or to texture alone - I guess what I am trying to ask
is for a more precise definition of the term.
Thanks! ;)
Susan in less than sunny seattle
Bacia Edelman on fri 29 aug 97
Susan Park asked if lichen glaze meant that the texture alone was similar to
lichen in nature or if it meant that the color also had to be the same as
actual lichen.
I have always interepreted it as texture alone. Sure, lichen on trees is
beautiful, but the greenish gray color is certainly not a requirement. The
term is referential.
If I find a piece of bark with lichen on it, I might take it home and place
it with my amazing stone finds, but duplicating it is not my intention nor
is it possible.
My lichen glazes are any color I choose.
Bacia Edelman
Bacia Edelman on thu 4 mar 99
I already deleted the Digest with the question . Someone, whose wife is a
weaver and uses some lichen in the woven work, asked if real lichen was used
in a glaze. No, it isn't because lichen is a combustible and would burn up
early in the firing. What it leaves behind might be strange: try it.
I have heard of "alligator glaze", a cone 04 glaze (don't have the recipe).
Take it from there.
Maybe my calling a glaze lichen instead of, say, crawl is a poor choice.
There are however a lot of pictures of what I call a lichen glaze
(overloaded with Magnesium carbonate and not to be dreamed of for functional
pieces) in Ceramics Monthly. If you subscribe or can get hold of a copy of
the March issue, there is a picture of a bowl by the late Robert Washington
on p.47. The two outer rings (whitish on black) are a lichen or crawl glaze
by my own terminology.
My use of that type of glaze, forming islands of assorted size, over a
vitreous engobe or another glaze, may be seen in a picture of one of my
teapots in Sept. 98 Ceramics Monthly in a spread about a Ceramics USA show.
Bacia Edelman Madison, WI
De Witt on sun 7 mar 99
No, it isn't because lichen is a combustible and would burn up
early in the firing. What it leaves behind might be strange: try it.
I asked the question, and boy am I sorry I did. I have received many direct
e-mails questioning my intelligence because '... organics are combustible
and would burn up in the firing." However I have sat through many
discussions of how much of such and such chemical to add to get what color.
Where does the dye property of an organic come from, if not from processed
minerals which are not organic that are included in the lichen, flower,
wood? No one seems to have any problem with the fact that wood ash from
different sources gives different effects where is the difference? Yes to
get the color for lichen weavers need to leach out the "color" in ammonia
for quite a while and yes we are not talking of kilograms of non organic
chemicals but we are not talking of kilo of organics either.
Still as I said in my original question "Inquiring minds want to know. " I
wish I had a kiln that I could try this.
Or am I relay after all ignorant?
Cliff
Martin Howard on tue 9 mar 99
I am also interested in using plant ash, if not as a main glaze
component, then as a colorant.
I fire at cone 02 - 1, so using wood ash tends to only give me very matt
glazes. It is difficult to achieve the right balance in accordance with
limit formulae that way. I now have good clear glazes using cat litter
and the slop from cutting granite memorials, plus a low cone borax frit.
But, if we only knew more plant ash analyses, then, linking that
knowledge with our knowledge of what elements produce which colours, we
could well have a list of plant ashes, including lichen, ferns, grass,
straw, different hedge clippings (which are often a problem to dispose
of in small gardens).
Some of these are known, but it seems that the analyses were done a long
time ago and hence, probably unfairly, we tend to ignore them.
Martin Howard
Webbs Cottage Pottery and Press
Woolpits Road, Great Saling
BRAINTREE
Essex CM7 5DZ
01371 850 423
araneajo@gn.apc.org
Gretchen Zinkan on sat 9 feb 02
My apologies...if this comes across twice. I think I broke list protocol
last time by making a political statement about the British Columbia
government....guess I won't that mistake twice. Thank you to the
moderator...Joyce, Mel you both do such great jobs!
Dear fellow clayarters
A month or so ago Kdarby@TMN.com posted a Lichen glaze which I made, tested
and loved for sculpture purposes/non functional pieces. The texture is
amazing...my tests pieces were delightful.
Then I got "the book". Ron, John...thank you. It is amazing and
overwhelming...and to quote so many people, I didn't know what I didn't know
until I read it. Not only that, I am now on lesson two of Insight...and
subtle understanding is beginning to occur (but I want it all right now!!).
So, I have a dilemma...do I re-post it...or not? Suffice to tell you it is
a lichen glaze...and I bet you could find it in the archives somewhere...and
just from the look of it my guess is that you SHOULD NOT use it on
functional wear...but I bet our wonderful glaze guru's from around the world
will tell us about it...I am hoping.
My second firing of this lichen glaze was going to be on a sculpture I was
blessed with this summer from Bob Kinsie ....and it is it's second firing
but I didn't get the lichen effect that I did on my test piece and I am
wondering why?
My hunches are
1) the piece had been fired before to ^10 of Laguna's Kinzie mix and I was
firing to ^6
2) my test pieces were bisqued to ^06, glazed with an underglaze, then the
lichen glaze
3) the bisque ware is Plainsman ^6 (great clay)
or perhaps
4) the lichen glaze may deteriorate over time
Any discussion about this would be greatly appreciated.
Thanks,
Gretchen
gzinkan@cyberlink.bc.ca
Paul Lewing on sat 9 feb 02
Gretchen, I can't answer your question about what happened to your lichen
glaze on different clay bodies, but I will tell you that you're undoubtedly
correct in thinking it's not a stable glaze. The only way to achieve a
lichen glaze effect is with a glaze with an incredibly low Si:Al ratio. In
other words, while these glazes may have enough alumina to be stable, they
cannot have enough silica to be stable, and still show the lichen effect.
Also, Ron and John have asked us not to post or hand out the glaze recipes
in their new book, and we should respect that. But, to my knowledge, they
are the only authors who feel this way about glazes in their books.
Heretofore, the rule that all of us have gone by is, if it's been published
anywhere, it's yours to use. I'm not going to comment on whether that
attitude is right or wrong, but I'd bet that 99% of potters out there would
agree that that's the way it is. So don't post R&J's glazes, but I'd really
hate to see their decision about those glazes stop people from posting glaze
recipes entirely. Especially since, if you're having trouble with a glaze,
how is anyone supposed to diagnose what's wrong with it without the recipe?
Paul Lewing, Seattle
Ababi on sun 10 feb 02
Let's divide our life to two parts. To the Bank which I am it's
manager , I am driving in my best car while on the weekend I drive my
jeep on the hills and not the other way around
Please enter to my site and see if you like any of my "jeep" glazes. I
shall send details to you and to the list, R&J are right, I would not
eat from these glazes but still these are very decorative ones.
Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
----------
Original Message ----------
>My apologies...if this comes across twice. I think I broke list
>protocol
>last time by making a political statement about the British Columbia
>government....guess I won't that mistake twice. Thank you to the
>moderator...Joyce, Mel you both do such great jobs!
>Dear fellow clayarters
>A month or so ago Kdarby@TMN.com posted a Lichen glaze which I made,
>tested
>and loved for sculpture purposes/non functional pieces. The texture is
>amazing...my tests pieces were delightful.
>Then I got "the book". Ron, John...thank you. It is amazing and
>overwhelming...and to quote so many people, I didn't know what I didn't
>know
>until I read it. Not only that, I am now on lesson two of Insight...and
>subtle understanding is beginning to occur (but I want it all right
>now!!).
>So, I have a dilemma...do I re-post it...or not? Suffice to tell you
>it is
>a lichen glaze...and I bet you could find it in the archives
>somewhere...and
>just from the look of it my guess is that you SHOULD NOT use it on
>functional wear...but I bet our wonderful glaze guru's from around the
>world
>will tell us about it...I am hoping.
>My second firing of this lichen glaze was going to be on a sculpture I
>was
>blessed with this summer from Bob Kinsie ....and it is it's second
>firing
>but I didn't get the lichen effect that I did on my test piece and I am
>wondering why?
>My hunches are
>1) the piece had been fired before to ^10 of Laguna's Kinzie mix and I
>was
>firing to ^6
>2) my test pieces were bisqued to ^06, glazed with an underglaze, then
>the
>lichen glaze
>3) the bisque ware is Plainsman ^6 (great clay)
>or perhaps
>4) the lichen glaze may deteriorate over time
>Any discussion about this would be greatly appreciated.
>Thanks,
>Gretchen
>gzinkan@cyberlink.bc.ca
>________________________________________________________________________
>______
>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.
Gretchen Zinkan on sun 10 feb 02
Dear clayart members
I am enclosing the lichen glaze recipe that I was asking for your thoughts
on in my last posting. This is NOT for functional use....but I really liked
it on my test tiles, less so on my bisque ware, and even less so on a
previously fired to ^10 kinzie mix sculpture. The last was so disappointing
as I would really see it perfectly (in my mind's eye) on the sculpture.
I am one of those people who would try and try different glazes; sometimes
they were good, other times not. Rather than having any idea about what was
causing the problem, I would find another, that worked...for some reason
unbeknownst to me. It is rather exciting to begin to have some clue as to
what is going on.
Ababi, I loved your analogy. Yes, sometimes, I would rather drive a jeep
but it's helpful to know it's a four wheel drive (and I don't/didn't know
that about my glazes).
Ron/John's book is great...and so is Michael Bailey's...I've been using both
of them...the more different ways I see examples, tables, etc. the more I
have been able to learn.
Lichen glaze ^6 oxidation (from Kdarby@TMN.com)
30g soda feldspar
30g magnesium carbonate
10g ferro frit 3134
10g talc
20g kaolin
I didn't copy anything else down, I'm embarrassed to say, because at the
time I didn't pay any attention to anything else other than this.
Like I said, I didn't know what I didn't know...and when dealing with
chemicals, and chemical reactions and the public that is rather sad.
Fortunately, I am just learning again, after a long absence from clay so I
haven't put anyone's health at risk, other than mine.
Thank you to clayart members for their patience, understanding and
encouragement. I continue to learn so much from you.
Gretchen
Ababi on mon 11 feb 02
Hello Gretchen!
This glaze, I found at the ceramic web.
It is one of the less "wild" lichen" glaze. it makes kind of rounded
islands of glaze. The person who added it said it been used in
different ways, if I remember, one of them was to apply above the
glaze, colorants. You must apply it thick. If you look at the fired
piece ( BTV I am fired from the bank) , You will see that in the "sea"
around the white rounded island of whit glaze, there is shiny glaze too.
In my humble site there is a test tile of this glaze.
I send here the recipe, as my soda feldspar is different than yours.
You might try to adjust your recipe according to my results.
The nearest material to "my" soda feldspar is Nepheline Seynite.
LICHEN GLAZE
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1201 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
FELDSPAR SODA F7/SE 30.00
Magnesium Carb Light 30.00
FRIT 3134 10.00
TALC 10.00
ENGLISH KAOLIN CC31 20.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.132 5.82%
CaO 0.071 2.70%
MgO 0.797 21.82%
Al2O3 0.222 15.35%
B2O3 0.060 2.85%
SiO2 1.261 51.44%
TiO2 0.000 0.02%
K2O 0.012 0.80%
Na2O 0.119 5.03%
Al:Si 5.68
Expan. 6.26
ST 416.39
FELDSPAR SODA MAFFIE F 7 SE
Seger Weight%
KNO 0.883 10.50%
CaO 0.052 0.55%
MgO 0.065 0.50%
Al2O3 0.905 17.53%
SiO2 6.210 70.92%
K2O 0.016 0.28%
Na2O 0.867 10.22%
Al:Si 6.86
Expan. 8.17
ST 342.79
LOI 0.3%
Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
---------- Original Message ----------
>Dear clayart members
>I am enclosing the lichen glaze recipe that I was asking for your
>thoughts
>on in my last posting. This is NOT for functional use....but I really
>liked
>it on my test tiles, less so on my bisque ware, and even less so on a
>previously fired to ^10 kinzie mix sculpture. The last was so
>disappointing
>as I would really see it perfectly (in my mind's eye) on the sculpture.
>I am one of those people who would try and try different glazes;
>sometimes
>they were good, other times not. Rather than having any idea about
>what was
>causing the problem, I would find another, that worked...for some
reason
>unbeknownst to me. It is rather exciting to begin to have some clue
as
>to
>what is going on.
>Ababi, I loved your analogy. Yes, sometimes, I would rather drive a
>jeep
>but it's helpful to know it's a four wheel drive (and I don't/didn't
>know
>that about my glazes).
>Ron/John's book is great...and so is Michael Bailey's...I've been
using
>both
>of them...the more different ways I see examples, tables, etc. the
>more I
>have been able to learn.
>Lichen glaze ^6 oxidation (from Kdarby@TMN.com)
>30g soda feldspar
>30g magnesium carbonate
>10g ferro frit 3134
>10g talc
>20g kaolin
>I didn't copy anything else down, I'm embarrassed to say, because at
the
>time I didn't pay any attention to anything else other than this.
>Like I said, I didn't know what I didn't know...and when dealing with
>chemicals, and chemical reactions and the public that is rather sad.
>Fortunately, I am just learning again, after a long absence from clay
>so I
>haven't put anyone's health at risk, other than mine.
>Thank you to clayart members for their patience, understanding and
>encouragement. I continue to learn so much from you.
>Gretchen
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