Jump to content
Sign in to follow this  
Benhim

New Engobe

Recommended Posts

I've just started working with a new engobe and wanted some guidance as to how much colorant to use for different colors. I'm looking for a green, yellow, red, black, blue and any other safe color I can make.

 

Here is the new engobe recipe I'm using as a base, it's from Zakin's book where I've gotten many of the recipes I'm using currently in my studio.

 

Cone 6

Nepheline Syenite 24

Flint 18

Boron Frit 6

Kaolin 36

Dolomite 10

Zircopax 6

 

 

I have many of the traditional colorants, Iron Oxide, Manganese Dioxide, Cobalt Carbonate, Chrome, Titanium Dioxide, Copper Carbonate. I'd like to stay away from Manganese Dioxide as much as possible because of the probability of leaching as this will be used on both functional and non functional ware.

 

Thanks

Share this post


Link to post
Share on other sites

Attached are some recipes I use for colored slips/engobes attributed to Cynthia Bringle. The base recipe is the same; however, various potters have taken different approaches to colorants. It is pretty much trial and error until you get the color/hue that you like.

 

 

Share this post


Link to post
Share on other sites

Thanks for that, it's quite interesting. I've never seen colorants used like NCSU. I've only used 10 - 20% in an engobe. Any idea of what that much iron, chrome, or rutile will do under a base clear glaze? I can imagine in the salt/soda those would be dark colors.

Share this post


Link to post
Share on other sites

I've only used the Bringle Slips during a salt firing for exterior decoration; no clear overcoat, just slip on the clay body. So, I was not worried about leeching or anything like that.

 

If used for a food surface, I'd have to recommend having testing done. That is the only way to find out for sure. But, given the percentages of some (manganese oxide and cobalt carbonate in black, for instance), , I can pretty much guess they will come back not suitable for food surfaces.

Share this post


Link to post
Share on other sites

I've only used the Bringle Slips during a salt firing for exterior decoration; no clear overcoat, just slip on the clay body. So, I was not worried about leeching or anything like that.

 

If used for a food surface, I'd have to recommend having testing done. That is the only way to find out for sure. But, given the percentages of some (manganese oxide and cobalt carbonate in black, for instance), , I can pretty much guess they will come back not suitable for food surfaces.

 

 

Great thanks, most of what I'm doing is going to be decorative, but I'd like to have some safe mixtures as well.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.