Hi

Try etchal glass from -http://www.enamelworksupply.com/supplies.html or hydrofluoric acid.

I am not sure if this help but maybe you can repeat then the firing.

Rudolf

If you want to remove it all, http://grainsofglass.ning.com/group/thenotebook/forum/topics/tips-for-removing-enamel-from. I think Rudolf gave good advice with the etchant, if you only want to remove part of the enamel.

From the look of this piece, I don't think you will be able to safely sand or grind the enamel off without damaging the metal. Whatever you do, I'd test the process on another sample piece first.

Debbie K

Thank you both for suggestions,

My problem is that I dont have tools to reapply the enamel or knowledge on how to recreate that convex effect of it...

I was thinking to use a felt disc on which to apply a slightly abrasive paste, which usually is used to polish metals. After this to use a micro-crystalline wax for shine.

That hydrofluoric acid, actions like a bleach agent for cloths?

Best regards,

Alex.B.

Never use hydrofluoric acid. It is one of the most dangerous acids. Hydrofluoric acid burns can go through to the bone and even destroy the bone. The burns are very painful and very difficult to heal.

Edmund

Thank you Edmund for warning me about it's effects but, is doing the job or not? also does this acid affects the silver base? What about the cloth wheel with abrasive paste... could that work?

Best regards,

Alex.B.

Hallo Alex,

Yes, the hydrofluoric acid would etch away the enamel. The silver could be covered for protection with a thick layer of asphalt- paint. But, honestly, I would never use hydrofluoric acid outside of a profesional laboratory. !

Polishing paste alone can not abrade enamel. I would try to remove the top layer of enamel with a flexible shaft and small diamond cutters. The enamel must probably not be completely removed. A few 1/10 mm should suffice. Then I would carefully apply a fresh layer of wet enamel,drying and burning. A guarantee that it works, I can not give.

Before the use of hydrofluoric acid in the Hobby Werkstatt I would caution insistent again. It  needs an acid resistant workplace with exhauster and air wash system and an appropriate full-body protective clothing.

Edmund

Hello all,

Following Mrs. Trish advice, I open this topic with some hopes.

I need your opinions/advices on an over fired enamel piece.

You have below some picture with the piece burned enamel and with an original finished one.

I would like to know if there are some possibilities to remove that fire damage to the enamel, without affecting the piece too much tough. Someone suggested me to use sandpaper with a fine granulation but, I am afraid that the enamel would break/crack in its core or/and lose its glossy finish. As you can see, the enamel is bombed and not flat, and I don't want to change that too much. If you have encountered this problem in your firings and resolved it, please post and even if not, some suggestions are welcomed. 

Thank you all in advance,

Best regards,

Alex.B.