- This topic has 4 replies, 5 voices, and was last updated 8 years, 2 months ago by Anonymous.
- April 1, 2014 at 2:46 pm #10126jockoParticipant
When I was at OSU many years ago I polished chunks of crystal and pieces of blown glass. Once I got past the cork wheel to the felt wheel I was told the reason the felt step got that shinny finish was the wheel along with the cerium heated up the surface, I’m guessing like a fire polish. So before I go to the expense of the cork and felt wheels will that remove or reintroduce the film back into a nice shinny piece of glass?
Thank for your time
MikeApril 2, 2014 at 2:48 am #13312wordanaParticipant
You will need to remove the devit completely or coat the piece with a layer of powdered frit or with a devit agent (do a google search — you will find products such as spray-a, superspray, and a do-it-yourself solution made of borax). Just firing polishing without treating the surface will likely just cause the devit to spread.
Jester’s Baubles Fused Glass DesignsApril 5, 2014 at 8:12 pm #13313Stephen RichardParticipantApril 7, 2014 at 10:05 am #13314JolindaParticipant
Thanks so much for that reminder! I was just cruizing through the posts here, and even after fusing for many years now had a piece ready to refire after sandblasting off the devit…and sure enough it was about to go in without the Spray A …except for your good reminder.
Funny how things happen like that.
Windows listen attentively for the sound of broken glass.April 15, 2014 at 2:14 am #13315AnonymousInactive
Cerium oxide, combined with some water and heat, chemically bonds to the glass to fill the ultrafine scratches left behind by the previous abrasive (typically pumice). That heat – which is a result of friction – may be what you are remembering. That little bit of warmth (just warm to the touch – too much and you can thermal shock the glass) is a far cry from fire polish temps.
Helios Kiln Glass Studio
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