Blue Pontil Black Glass

[madpaddla]

Got this one in an auction. I was impressed by the ponitl.
Thanks all.

 

[madpaddla]

Nice pontil

 

[madpaddla]

Whittle

Any ideas on age, origin, etc. Thanks all
Madpaddla

 

[karis66]

Very Nice Bottle,I Pick 2 up at an auction a couple weeks ago no idea what they are but they are sure pretty. Congrats. Kari

 

[madpaddla]

Thanks Kari:
Does the blue mean a presence of iron ?

 

[RedGinger]

That's a nice bottle, Madpaddla. Good find!

 

[glass man]

I LOVE THE BOTTLE !I HOPE SOMEONE CAN EXPLAIN THE BLUE ALSO!

 

[TROG]

The blue colour is caused from the refiring of the glass to smooth out a rough pontil

 

[buzzkutt033]

i think what the folks are asking is, is this an graphite or iron pontil that is refired?? does the mineral deposit from the pontil create the blue color? if not, what creates the blueish area in brown/green glass??

Jim

 

[kungfufighter]

At risk of restating myself I am of the strong opinion that "refired pontils" are an urban myth. If the glassblower had the mechanical skills to hold the bottle while "refiring" the pontil why would he need a pontil rod in the first place? The blue hue seen at the base of some black glass bottles (and at times seen on the bottle as a whole) is the result of the use of "glassgall" (a turquoise blue opaque sulphate salt of sodium) in the attachment of the pontil rod to the base. It is most common in Belgian made bottles but also seen in English made bottles. The blue hue can also be the result of the rueuse of blast furnace slag in the batch of glass. Further info on the topic can be gleaned from Willy Van den Bossche's "Antique Glass Bottles."