Jump to content

Underglaze bleeding

Recommended Posts

Apologies in advance for the supidity of my question, I am a complete beginner who loves sculpting but hates the technical side of firing! I have been making very small porcelain pieces of jewellery for  a while, which I decorate with underglaze  before bisque firing, then covering with a clear brush on glaze. I have been taking my pieces to a local shop to fire them, and they have always come back perfect and no bleeding of underglaze colours. I have recently moved to a new area and took them to a new kiln to be fired. This time, the underglaze bled after they were glaze fired, and ruined the pieces. I have since bought my own little electric kiln and have fired some more pieces, (to cone 6, standard speed) and the same bleeding has happened.  As my materials and techniques when making the pieces is identical, I can only assume it is the firing that is making the difference. Does anybody know what is likely to be causing this bleeding? Could it be caused by the temperature of the firing or the speed?  I have tried contacting the original shop that did such a great job but they have not  replied to me. Thanks in advance for any tips! 

Link to comment
Share on other sites

i would continue to ask the original shop BY TELEPHONE!  get to a technical person or whoever fires the kiln.  only that person can tell you what may be different about your firings in the past.   

perhaps your kiln is different in some way.   what do you mean by standard speed?  have you tested the heatwork with cones?

Link to comment
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.