Hank Ray on thu 15 oct 98
In a message dated 98-10-14 09:25:16 EDT, you write:
<< This glaze doesn't look like it will melt at cone 6 and the total is only
>95 - could there have been something left out - like 5% G. Borate? If that
>is the case I would agree it is probably food safe - with reasonable
>amounts of stain or oxide. Just keep in mind - the amount of any oxide that
> can be held in solution in a glaze varies with each oxide - the Hamer book
>give some guidelines in this area.>>>>
Hey Ron..... i posted this glaze .... awhile back and you said it looked
good then...
along with some otheres (tom buck i think) i've done the freezer to boiling
water test... the boiling water to cold water test... and i tested three
diffent oxide comba nations...with the vinger test... the test were 1) Cobalt
Carb.-2, MangDio-2% RIO-2%, Tin Ox.-2% (this by the way makes a nice black)
2) Copper Carb-5%
3) Cobalt Carb.-2% i soaked all three test pieces in vinger for a
week......
with no change.....
to refresh your memory .... you got mad at me because i had put in the subject
heading "Attention Glaze Police" i said i was sorry and we kissed and made
up..
the recipe only equals 95 because if you change it to equal 100 then the
numbers get ugly and such... and there is no need for it.. when 95 is close
enough.....
the rest of the post...
>Here is a cone 6 satin glaze... that is durable and food safe base when used
>reasonably with colorants.... that of coure is my disclaimer.... for a white
>you can add an opacifier.... 4or5 % tin or 8 or so % zircopax
>
>Saturday base cone 6 satin glaze
>dolomite..............19
>whiting..................3
>custer felsdspar....35
>om#4(ball clay).....19
>flint......................19
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm >>
Peace...
Peter in oklahoma... who thinks Ron is a really cool dude ... to take time to
check all these glazes on clay art......
Ron Roy on fri 16 oct 98
Hi Peter,
You are making me laugh.
The reason I expressed some concern about this glaze is: The alumina is a
little over supplied - not much - but the MgO is way over. This is when I
use the limits supplied with Insight.
I am wondering if the over supply of certain oxides is not as much concern
as the under supply of say silica or alumina. Does anyone have any hard
information in this area?
Perhaps those of you who are interested in having glazes tested would be
willing to do this with the black version listed here.
Thanks for adding this info Peter - best regards,
Constable Ron.
>----------------------------Original message----------------------------
>In a message dated 98-10-14 09:25:16 EDT, you write:
>
><< This glaze doesn't look like it will melt at cone 6 and the total is only
> >95 - could there have been something left out - like 5% G. Borate? If that
> >is the case I would agree it is probably food safe - with reasonable
> >amounts of stain or oxide. Just keep in mind - the amount of any oxide that
>> can be held in solution in a glaze varies with each oxide - the Hamer book
> >give some guidelines in this area.>>>>
>
>Hey Ron..... i posted this glaze .... awhile back and you said it looked
>good then...
>along with some otheres (tom buck i think) i've done the freezer to boiling
>water test... the boiling water to cold water test... and i tested three
>diffent oxide comba nations...with the vinger test... the test were 1) Cobalt
>Carb.-2, MangDio-2% RIO-2%, Tin Ox.-2% (this by the way makes a nice black)
>2) Copper Carb-5%
>3) Cobalt Carb.-2% i soaked all three test pieces in vinger for a
>week......
>with no change.....
>
>to refresh your memory .... you got mad at me because i had put in the subject
>heading "Attention Glaze Police" i said i was sorry and we kissed and made
>up..
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
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