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Karen B

Crocus Martis Yellow? Grog Brains.

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Karen B    26

I must have grog for brains. I was mixing up 5 large batches of glaze yesterday.

Despite careful planning, I miscalculated and was short the amount of Yellow Ocher I needed for one,

which is to be a translucent green glaze, which I discovered about 11pm.

I was despairing, because schedules, deadlines, you know. I came across a bag of Crocus Martis Yellow.

It looked exactly the same! Yes, I used it to finish the glaze.

Now, as I am sieving, I notice some redness in the strainer.

PLEASE TELL ME IT IS NOT LIKE RED IRON OXIDE! Please tell me it is yellow when fired.

Just tell me the truth. Am I screwed?

Thank you,

Karen

 

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Karen B    26

Crocus Martis is a form of iron oxide. Not much on the internet when searched for crocus martis yellow.

 

I couldn't find anything either. Thanks for looking.

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Mark C.    1,807

You now will have a new glaze one that is most likely a bit different from what you expect.

Since you did nor mention how much you put in? I would treat this like a glaze test

and not glaze all you work but just a few things until you know what you have.

Mark

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Babs    386

Hope the person who was not going to kiln wash her shelves is reading......

Good luck Karen.

Got the chem comp of Yellow ochre?? FeOH

Prob will be paler as from reading, crocus martis unless calcined will gas off a lot in firing. therefore weight for weight it will give less colouring effect.( I think) Croc  FeSO4

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Karen B    26

Lucky me. The test on the left is the glaze from the test batch. The test on the right is the new batch with the crocus martis yellow.

 

Just a note that the other colorant is Copper Carb.

 

 

post-2655-0-66178700-1408410451_thumb.jpg

post-2655-0-66178700-1408410451_thumb.jpg

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Karen B    26

Hope the person who was not going to kiln wash her shelves is reading......

Good luck Karen.

Got the chem comp of Yellow ochre?? FeOH

Prob will be paler as from reading, crocus martis unless calcined will gas off a lot in firing. therefore weight for weight it will give less colouring effect.( I think) Croc  FeSO4

Wanted to thank you for the chem comp Babs.

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Babs    386

Ah intuition somewhere you knew it was ok!  Nice glaze Karen it really picks up the texture.  Now what is cheaper? Crocus or Ochre? 

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Marcia Selsor    1,301

Yellow iron and yellow ochre can be used as the same in some instances. I never heard of yellow crocus martins but It may work out ok for you.
Marcia

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oldlady    1,323

karen, i have some yellow ocher if you would like it.  have had it since early 90s and never used it. it weighs about a pound on my 1950s baby scale.  it is yours for postage if you like.

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Karen B    26

Ah intuition somewhere you knew it was ok!  Nice glaze Karen it really picks up the texture.  Now what is cheaper? Crocus or Ochre? 

 

,Thanks Babs.   I'll have to remember to look at the catalog when I go into the studio to look it up.

 

I don't think it is calcined, doesn't say on the label.

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Karen B    26

karen, i have some yellow ocher if you would like it.  have had it since early 90s and never used it. it weighs about a pound on my 1950s baby scale.  it is yours for postage if you like.

 

Yes, I would like it. That is generous of you.

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oldlady    1,323

will take it to the post office.  it probably will fit in the aprox $5 box.  pm an address.

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