Is this devit? - WarmGlass.com

Is this devit?

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frizzygirl
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Is this devit?

Postby frizzygirl » Fri Jun 15, 2012 10:45 am

Hi all

I've made a plate ready for slumping but have found marks on some of the colours of the glass.

Its two layer white BE with 1.2 colours laid ontop and fully fused slowly. The discolouring only seems to be on some of the opal colours, like dark plum, one of the purples (don't know which), orange and red. Hopefully the photos will catch what I mean.

Also is there a way of removing this, eg using a diamond hand pad to rub it over and then devit spray and fire again.

Thanks for your help.

Tracey
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Stephen Richard
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Re: Is this devit?

Postby Stephen Richard » Fri Jun 15, 2012 7:15 pm

In my experience opals are more prone to devit than transparent glasses. So, you have to make sure the glass is perfectly clean before firing.

Yes you can use a hand pad and water, or even wet and dry sandpaper, again with water to abrade the surface. Clean very well, add devit spray if desired. The devit spray I use is a solution of borax (without the additives).
Steve Richard
You can view my Blog at: http://verrier-glass.blogspot.com/

Valerie Adams
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Re: Is this devit?

Postby Valerie Adams » Fri Jun 15, 2012 9:35 pm

Try spraying and refiring first. I've "cured" devit on certain opals by doing that. You have to fire to about 1425° to cure the spray.

David Jenkins
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Re: Is this devit?

Postby David Jenkins » Sat Jun 16, 2012 8:51 am

The devit that shows in the OP's pictures is in rectangular shapes - or so it seems to old eyes. Is this typical/normal? Or am I perhaps mistaking a reflection of some sort as the devit in question? Here's a screenshot where I've identified what I perceive to be a corner of one of the rectangles:

2012-06-16_0715.png
2012-06-16_0715.png (26.25 KiB) Viewed 3639 times
Last edited by David Jenkins on Sat Jun 16, 2012 3:26 pm, edited 1 time in total.
Dave Jenkins
Glass at Harbor Gates
Cypress, TX

frizzygirl
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Re: Is this devit?

Postby frizzygirl » Sat Jun 16, 2012 1:41 pm

Thank you for the replies, I will buy some devit fluid and try it.

The worst of it is around the edges of the rectangles, as though its the sides of the coloured glass that have flattened in firing and devitrified.

The bit you identified David is a reflection though as that rectangle is fine.

Thanks for all the help though.

Best wishes
Tracey

Valerie Adams
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Re: Is this devit?

Postby Valerie Adams » Sat Jun 16, 2012 1:43 pm

If you did any grinding to your edges, that could be what you're seeing: grinder scum.

Lynn g
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Re: Is this devit?

Postby Lynn g » Sat Jun 16, 2012 6:56 pm

I've noticed that some opals, when full-fused, seem to show a different color on the top than along the flattened-out edges. Not devit,just a slight color difference.
Lynn g
"Patriotism is not enough, I must have no hatred or bitterness towards anyone." - Dame Edith Cavell


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