hemihampton
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Here's a couple pics
of a pontiled bottom. LEON.
of a pontiled bottom. LEON.
Help identifying bottle with no markings.
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saratogadriver
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Re: pontil. Look at the bottom pic that you've shown. You see it sort of has rough glass over much of it. That is a pontil. Different than the "blowpipe style" pontils that you see in the aqua bottles above. But a pontil nonetheless. There's also iron and graphite pontils, which have a bottom covered in a dull looking material, usually either dark or sort of rust colored, which was from a pontil rod designed to leave a bit of material on the bottom but no broken glass ring. The pontil on your bottle is pretty consistent with those that you see on bottles of that form.
Jim G
Jim G
Harry Pristis
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This is good information from Jim G, except there is no such thing as a "graphite" pontil scar. This is another collector-generated misnomer stemming from mistaking iron oxide residue for graphite.
hemihampton
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I always thought Iron Oxide residue as you call it was a dark brownish-reddish color while the graphite residue was a different color, more of a dark grayish or charcoal color. Am I wrong? LEON.
Harry Pristis
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On page 48 of his THE ILLUSTRATED GUIDE..., Cecil Munsey says:
"The term 'graphite pontil' is completely inaccurate. Except for the fact that the mark left by the bare iron pontil is sometimes black, which is the color of graphite, there is no justification for the term."
"The term 'graphite pontil' is completely inaccurate. Except for the fact that the mark left by the bare iron pontil is sometimes black, which is the color of graphite, there is no justification for the term."
whittled
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It's like still saying that a pencil is lead, it isn't. Graphite is very slippery and thermally stable, completely unsuitable for bonding glass to a rod..
tropichahni
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Ok got that... So now is this called open pontil?
Harry Pristis
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"Graphite" pontil is a misnomer for "bare iron pontil" or sometimes "improved pontil."
"Open pontil" is another term for "blow-pipe pontil." The "open" refers to the center of the ring of glass which corresponds to the opening of the blow-pipe.
"Open pontil" is another term for "blow-pipe pontil." The "open" refers to the center of the ring of glass which corresponds to the opening of the blow-pipe.
hemihampton
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So when you say Iron Oxide residue is it because it is Iron Oxide that is used in the process. And if so what color is this iron oxide residue. THANKS. LEON.
Harry Pristis
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The iron oxide residue is from the red hot end of the bare iron pontil which is applied directly to the nascent bottle. The residue is of variable color, often dark gray to black.
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