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Butterscotch rod

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Butterscotch rod

Postby atxmbb2-shopper » Thu Dec 28, 2017 10:03 am

bscotch (2).jpg
bscotch (2).jpg (44.89 KiB) Viewed 5862 times
Hello...

Any thoughts on why the center of butterscotch rod is red? There is always a slight discoloration in the center of rod. This is my first time seeing red though.

Thanks,
Marcia
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Re: Butterscotch rod

Postby ejgiebel » Sun Dec 31, 2017 12:33 pm

The folks at Bullseye might have a different opinion, but my experience with Butterscotch is that at high temps the color can change. I did a screen melt once, holding at 1650 for 60 minutes, and the Butterscotch all turned a color like Sunflower Yellow. I've seen Yellow turn Black on someone's piece using the same technique. Thus I try not to use the Sulphur colors at high heat.
Ed Giebel
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Re: Butterscotch rod

Postby marykaynitchie » Thu Jan 04, 2018 5:09 pm

Bonnie's comments:

It could be color variations resulting flow & heat history as mentioned by Ed in the second post.

A brief description of lay-up and heatwork (process temp & hold time) would be helpful. Are we looking at a detail of a fused cross section of Butterscotch rod? 


Mary Kay
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Re: Butterscotch rod

Postby atxmbb2-shopper » Wed Jan 10, 2018 5:29 pm

Thanks for the reply. Yes, you are looking at a cross section of rod. It has flowed to 3 or 4 times it's normal size. The process temp was 1525 with a 30 minute hold.
Marcia
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Re: Butterscotch rod

Postby atxmbb2-shopper » Mon Jan 15, 2018 8:49 am

It has been fired twice.

The first schedule
800->1500->15 minutes.
Anneal 900 30 minutes

The 2nd schedule
250->1000->20 minutes
600->1525->30 minutes
Anneal 900 1.5 hours


I use a fiber kiln
Marcia
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Re: Butterscotch rod

Postby marykaynitchie » Wed Jan 17, 2018 12:44 pm

Bonnie has additional comments:

Heatwork & flow have stretched the cross section & any initial variation in color has been intensified. It's relatively common for opalescent rods to have a central dot/streak, often darker than the overall color if viewed on end. It typically remains through firings & should be used as a design element if firing rod on end. It's a small amount of transparent that gets drawn in during the forming process.


Mary Kay
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