Jump to content

Using Red Iron Oxide along side cone 5 glazes

Recommended Posts

Hello! I need some specific help with using RIO. I typically use stoneware clay #50 from Laguna and bisque to 06-04 and glaze to cone 5.

I have applied RIO to my bisque ware and attempted to fire directly to cone 5 alongside glaze. The result was that the RIO had burnt off completely. So, I need specific steps:

Bisque normally, apply RIO, re-bisque? What cone? Apply glaze and fire to full cone temp? Do I need to add flux to the RIO? I read 50/50 RIO and Gerstley Borate was needed to prevent the stain from burning out. Please advise. I cannot find any step by step help!

Link to post
Share on other sites

I use a mix of red iron oxide and water to mark my logo on my ware, and for decorative marks.  Treat the mixture like  using  water color on paper.  To get a good colored mark requires a good application.  My mix is about 1/3 of a peanut jar of dry RIO and fill the jar with water.  Shake shake shake.  I apply on green ware, bisqued ware, and over glaze applications.  Works for me at Raku, cone 3, cone 5, and cone  10 +.  All kinds of clay body’s.  
took a few test marks before I got the hang for making good marks.  

Link to post
Share on other sites

Hey, Julie...Here is what happened to a couple of my little flowerpot gremlins...the one on the right has 3 coats RIO on ^04 bisque fired to ^06.  The RIO was just a tad chalky. So I thought it would be a good idea to put a clear glaze (3 coats) and refire to ^06. The result was the mottled yellow and black one on the left. I have done RIO and fired to ^10 and the result without clear was a semi-metallic gun metal gray color that was permanent. Something to consider...


Link to post
Share on other sites
3 hours ago, Julie T said:

I will go for another application and then, should I run it through a second bisque before a glaze firing?

If you aren't glazing it then no it isn't necessary to re bisque fire. If you are glazing the iron can smudge if not bisqued on first. Do a test tile at the same time, try a heavy dark application, a medium one and a light one, try one coat and two or three, see what happens. If you glaze over an iron wash or apply the wash over a glaze if there is a high amount of calcium in the glaze the iron will tend to "bleach" out and go a straw colour.

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.

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.

  • Create New...

Important Information

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