donwrob
has rocks in the head
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Member since June 2003
Posts: 509
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Post by donwrob on Oct 8, 2003 23:02:12 GMT -5
Hi all, I am tumbling a batch of slag glass from an old factory in Pa. A friend of mine and I picked it up about 5 or 6 years ago and I remember the guy at the factory telling us about a weird optical property that some of the glass had. It is a pretty purple color under outside lighting and incandesent lighting. But when under flouresent lighting it is blue, not purple. Sure enough, the majority of the glass in the load I'm running is that same weird stuff. I didn't remember about it until I pulled a few pieces to check it's progress and looked at it in the kitchen under floresent lighting. Baby blue as can be. I wish I could remember the name of this special property. Anyone out there know what it is called? I'll take pics of it when it finishes, under both lights so you can see what I'm talking about. Later all, Don This is your tumbler ![:D](//storage.proboards.com/forum/images/smiley/grin.png) This is your tumbler on rocks ;D
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Post by TJ on Oct 9, 2003 10:33:48 GMT -5
The property is called pleochroism; best demonstrated by chrysoberyl, the "alexandrite" variety of which is famous for its red to green color change in, respectively, incandescent and daylight.
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donwrob
has rocks in the head
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Member since June 2003
Posts: 509
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Post by donwrob on Oct 9, 2003 11:59:45 GMT -5
Thanks TJ, that name sure doens't ring a bell. But, it was quite a while back.....could have been. Thanks again, Don
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donwrob
has rocks in the head
![*](//storage.proboards.com/forum/images/stars/star_pink.png) ![*](//storage.proboards.com/forum/images/stars/star_pink.png)
Member since June 2003
Posts: 509
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Post by donwrob on Oct 9, 2003 14:08:35 GMT -5
OK, me again. I have racked my brain trying to remember the name of the glass. Some of the things still floating around in there are almost scarey ![:o](//storage.proboards.com/forum/images/smiley/shocked.png) It finally came to me, Photocromic glass. This is what he called it at least, correct or not. I pulled a few pieces which are midway in step 2 and stitched a small pic for those interested. The color change is not as dramatic in the pic as in real life though, but you can see the difference between the normal lighting on the left and the florescent light on the right. Good day all, Don ![](http://photos.imageevent.com/donwrob317/flintstonerubble//slagstitch.JPG)
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Post by Noosh9057 on Dec 2, 2003 18:05:51 GMT -5
Those rocks are very nice. Were could I get some.
Do thay tumble good?
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Pdwight
has rocks in the head
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Member since June 2003
Posts: 619
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Post by Pdwight on Dec 4, 2003 2:04:33 GMT -5
Perhaps they have a Dichroric content, this is a metal based die that has good optical cutoff properties for different colors.....for example a piece of Magenta Dichroric glass wil pass only magenta light while reflecting green (the oposit of magenta) light as high effenciency.
Hope this helps Dwight P
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