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Author Topic: What's going on with this dump weight?  (Read 879 times)

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Offline uphoosier

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What's going on with this dump weight?
« on: December 20, 2007, 07:23:24 PM »
Sorry, but this is my first dump weight.  What is going on at the bottom with the red?  Notice it trails up into some of the bubbles a slight way.  Thanks for looking. 

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Offline KevinH

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Re: What's going on with this dump weight?
« Reply #1 on: December 21, 2007, 12:26:39 AM »
That's a good question - and one which I am not sure has been fully answered in the general literature. However, it is a fairly common feature of the base of these bottle-gflass Dumps (or doortsops). Perhaps it is some form of "rusting"?? How it gets there is not known to me. The colour and extent of this feature varies.

Here's another example. This shows overall rough "crystalisation" with a small central area that has "rust" inside it.
KevinH

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Offline uphoosier

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Re: What's going on with this dump weight?
« Reply #2 on: December 21, 2007, 01:49:43 AM »
Well, it looked like rust to me, but I felt kind of stupid to use glass and rust in the same sentence,  Thanks, Kev.

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Offline Leni

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Re: What's going on with this dump weight?
« Reply #3 on: December 21, 2007, 12:56:30 PM »
Isn't it where 'bits' (and that's a technical term, I'll have you know!  ;) ) come off the end of the pontil rod and contaminate the glass? 
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Offline aa

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Re: What's going on with this dump weight?
« Reply #4 on: December 21, 2007, 09:38:48 PM »
Hot glass is corrosive,like acid and it attacks the metal surface of the glassmaker's iron. Depending on the method of cutting in and detaching the piece from the iron, some metal can be detached from the iron and if the base is not ground away remain on the base of the glass. At the time this piece was made, I believe irons were made of mild steel.. and after a time, mild steel rusts. ;)
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Offline uphoosier

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Re: What's going on with this dump weight?
« Reply #5 on: December 21, 2007, 11:58:01 PM »
Thanks for responding and making that clear to me.
Ken

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