Looking For A Food Safe Orange

[Pugaboo]

I'm trying to find a replacement for the Coyote Orange I've been using because it has encapsulated cadmium in it. Does anyone know of a glaze of stain that is orange to orange-red that is cadmium (and lead of course) free?

 

I'm getting a package ready to send off to the lab for Cadmium testing but am also wondering if I can find a replacement for future use. I've looked up several manufacturers MSDS sheets but a lot of time they just do a group MSDS sheet and say some colors may contain cadmium, some may contain colbalt, etc but nothing specific.

 

I am willing to mix my own slip or glaze with a stain but... See previous paragraph.

 

I'm already working on changing the way the pieces are made so I can use a simple white glaze on the food surfaces and only using the bright colors on the exterior or rims of pieces. BUT I would like to add a detail to the center of the plates so it isn't such an expanse of white.

 

I wondering what do Maiolica potters use?

 

T

[PeterH]

A previous thread may be of interest:

http://community.ceramicartsdaily.org/topic/437-bright-colors-especially-orange/page-2

[Mark C.]

I doubt there is one . Cadmium is the main component of the color orange in ceramics.

[Joseph Fireborn]

I looked for a long time for an orange glaze that didn't use a stain. I wanted to put it in some of my work. I gave up. 

 

I imagine with enough testing of combinations of iron oxide with other colorants you could probably get close to some type of natural looking orange. There is a glaze called Orange Street. It looks more red to me though. 

[High Bridge Pottery]

Physics says no 

[Guest JBaymore]

Uranium oxide in a high sodium environment.     "Out of the frying pan, into the fire."

 

best,

 

................john

[neilestrick]

About 20 years ago I used to use a really nice earthy orange glaze that was fired in cone 10 reduction. Beautiful glaze. Definitely orange, but not bright. It wasn't Shane Orange, but something similar. It used iron and rutile for colorants. I'll see if I can find the recipe. It might be worth playing with at cone 6 if you're feeling adventurous.

[Mark C.]

Iron and rutile make a nice orange at cone 10.

it not the fiesta color orange but a more off pumpkin color

[Fred Sweet]

Try a search on Haystack Orange. Came from the Haystack School of Crafts, Deer Isle, Maine in the late 60's. It is, as Mark C stated, a pumpkin orange matt. Good come 9-10.

[Magnolia Mud Research]

Take your favorite clear base glaze and make a series of line blends with red iron oxide and rutile as colorants.  Somewhere between clear and say 20 % of iron and / or rutile or both you will find orange and or yellow.  At low concentrations you will likely have a transparent glaze.  At higher levels it will become opaque.  My experience has been in cone 10 reduction, but should work also in oxidation.  Have not tested glaze stability, corrosion, leaching or crazing.  Lots of other colors and texture (glossy to matt to both) are likely to appear. My screening pass started at 1% additive and doubled the additive for each subsequent test piece.  I stopped at 16% additive.  All were interesting.

 

LT

 

[jrgpots]

If you look at Community Challenge #5.  You can see the orange I came up with by adding Rutile to Amaco Dynasty red glaze ( cone 6.)  

 

Jed

[Mark C.]

Fred's spot on that Haystack orange  it is matt-not shiny and I would say a bit dry.

You could add a wash over it to gloss it up. You also will need to flux it out at cone 6 or cone 06-not sure which temp range you need

I tend to use it under my rutile base and fire cool and its more glossy-thats at cone 10