Nancy on sun 5 oct 08
Hey everyone....I've made a blunder and am hoping someone out there has
done and tell me what I've missed.
I made a batch of Jennie's purple a week ago. I've tested it twice,
once at cone 7, once at cone 6 and both have come out and awful light
blue transparent glaze. I obviously have missed something. I thought
maybe the chrome since it's so blue, but I remember putting the chrome
in. Can too little Tin cause the chrome/blue combination not work and
make purple? any help would be appreciated... Thanks! Nancy
The recipe I use is:
Neph Sye 18
Frit 3134 14
Whiting 20
OM-4 clay
18
Silica 30
Chrome Oxide 0.2
Tin Oxide 3.75
Cobalt Carbonate 0.6
Mary Starosta on sun 5 oct 08
Hey Nancy,
I have the same reciepe and it is a Deep purple for me cone ^6 Ox. I use
stoneware light brown. My best guess is you may have used Cobalt Carb at
6.0 instead of .60? Maybe and that would turn your purple to a deep dark
blue on white stoneware. Again, best guess hard to say why but maybe in the
measuring? Just a thought as I have been known to do that OOPS!
Mary Starosta
Colorado Potter
http://marystarosta.wordpress.com/
Where pumkins sometimes where Cowboy hats
On Sun, Oct 5, 2008 at 6:35 PM, Nancy wrote:
> Hey everyone....I've made a blunder and am hoping someone out there has
> done and tell me what I've missed.
>
> I made a batch of Jennie's purple a week ago. I've tested it twice,
> once at cone 7, once at cone 6 and both have come out and awful light
> blue transparent glaze. I obviously have missed something. I thought
> maybe the chrome since it's so blue, but I remember putting the chrome
> in. Can too little Tin cause the chrome/blue combination not work and
> make purple? any help would be appreciated... Thanks! Nancy
>
> The recipe I use is:
>
>
>
> Neph Sye 18
> Frit 3134 14
> Whiting 20
> OM-4 clay
> 18
> Silica 30
>
>
> Chrome Oxide 0.2
> Tin Oxide 3.75
> Cobalt Carbonate 0.6
>
--
Mary Starosta
www.StarostaTeam.com
ReMax Alliance
mary@starostateam.com
720-271-7523
Lynn Goodman Porcelain Pottery on sun 5 oct 08
>
Hi Nancy,
You forgot the tin. The purple color is a chrome-tin pink and must
have the tin to work.
Lynn
> I made a batch of Jennie's purple a week ago. I've tested it twice,
> once at cone 7, once at cone 6 and both have come out and awful light
> blue transparent glaze. I obviously have missed something. I thought
> maybe the chrome since it's so blue, but I remember putting the chrome
> in. Can too little Tin cause the chrome/blue combination not work and
> make purple? any help would be appreciated... Thanks! Nancy
>
> The recipe I use is:
> Neph Sye 18
> Frit 3134 14
> Whiting 20
> OM-4 clay 18
> Silica 30
> Chrome Oxide 0.2
> Tin Oxide 3.75
> Cobalt Carbonate 0.6
Lynn Goodman
Fine Porcelain Pottery
Cell 347-526-9805
www.lynngoodmanporcelain.com
tonya Johnson on mon 6 oct 08
I've written your recipe down to compare with a cone 6 purple I have, but in
just glancing I wonder if you were supposed to have used cobalt oxide. Mine
uses just a touch of chromium and then cobalt oxide. I once used carbonate by
mistake and it was much more blue. Tonya in Louisville, KY
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Mary Starosta on mon 6 oct 08
Well here's another thought. Without the Cobalt Carb that recipe would be
Raspberry. So it might be both in the tin like lynn suggested and the
Cobalt carbonate. I attched 2 pitures of jeannie's purple and minus the
cobalt carb is Raspberry. When I increase the cobalt carb from .6 to more I
get blue not Raspberry or purple. So that's why I think it's in the Cobalt
Carb. I get a very Dark blue if I make the mistake of 6.0 in the Coblat
carb.
Mary Starosta
Colorado Potter
http://marystarosta.wordpress.com/
Where pumpkins are growing everywhere
>
> Hi Nancy,
>
> You forgot the tin. The purple color is a chrome-tin pink and must
> have the tin to work.
>
> Lynn
>
>> I made a batch of Jennie's purple a week ago. I've tested it twice,
>> once at cone 7, once at cone 6 and both have come out and awful light
>> blue transparent glaze. I obviously have missed something. I thought
>> maybe the chrome since it's so blue, but I remember putting the chrome
>> in. Can too little Tin cause the chrome/blue combination not work and
>> make purple? any help would be appreciated... Thanks! Nancy
>>
>>
Nancy on mon 6 oct 08
Lynn
You may be right. I know I used Cobalt Oxide as Mary suggested I may
have used Cobalt Carb instead. I remember now....I was short on the
Tin...I thought I wrote it down but guess I didn't. So I'll order up
some more tin and add it a little at a time and see what happens.
Thanks for the info, it's much appreciated!
Nancy
Lynn Goodman Porcelain Pottery wrote:
>>
>
> Hi Nancy,
>
> You forgot the tin. The purple color is a chrome-tin pink and must
> have the tin to work.
>
> Lynn
>
>
>
>> I made a batch of Jennie's purple a week ago. I've tested it twice,
>> once at cone 7, once at cone 6 and both have come out and awful light
>> blue transparent glaze. I obviously have missed something. I thought
>> maybe the chrome since it's so blue, but I remember putting the chrome
>> in. Can too little Tin cause the chrome/blue combination not work and
>> make purple? any help would be appreciated... Thanks! Nancy
>>
>> The recipe I use is:
>> Neph Sye 18
>> Frit 3134 14
>> Whiting 20
>> OM-4 clay 18
>> Silica 30
>> Chrome Oxide 0.2
>> Tin Oxide 3.75
>> Cobalt Carbonate 0.6
>
> Lynn Goodman
> Fine Porcelain Pottery
> Cell 347-526-9805
> www.lynngoodmanporcelain.com
>
>
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