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Glass Identification - Post here for all ID requests => Glass => Topic started by: flying free on October 14, 2016, 08:05:57 PM

Title: textured old glass sand or something? black glass bottle 19th century
Post by: flying free on October 14, 2016, 08:05:57 PM

can anyone tell me how the base of this bottle was formed please?
http://www.aaawt.com/web_images/Bottle,-ASCR_bottom_843-228.jpg

I can see what looks like a pontil mark but it's the texture of the inside of the base that I'm particularly interested in - that subtle grainy effect.  Were they stood on sand to anneal or something?  is that even possible?
Hope someone knows :)
It's third pic down on this link.

m

Title: Re: textured old glass sand or something? black glass bottle 19th century
Post by: bat20 on October 15, 2016, 02:08:30 PM

This site may help https://sha.org/bottle/bases.htm

Title: Re: textured old glass sand or something? black glass bottle 19th century
Post by: flying free on October 15, 2016, 02:26:35 PM

Hi thanks :)
I've been through the site many times - it's a great site.
I just couldn't seem to find anything on this though.

m

Title: Re: textured old glass sand or something? black glass bottle 19th century
Post by: pamela on October 15, 2016, 04:55:18 PM

  This mark was formed when the hot glass gather on the flared or ball shaped tip of an iron pontil rod was slightly cooled then dipped in sand (or small glass chips) prior to application to the bottle base (Van den Bossche 2001).  The sand/glass chips were apparently intended to keep the pontil rod from adhering too closely to the bottle, facilitating easier removal.    (https://sha.org/bottle/pontil_scars.htm#Sand%20Pontil) 

Found this link in the page bat20 mentioned: "sand pontil scar"  :-*

Title: Re: textured old glass sand or something? black glass bottle 19th century
Post by: flying free on October 15, 2016, 07:28:19 PM

Thank you Pamela :)