Topic: Vintage ale glass double knop pinkish stem help please.

[brucebanner]

What do you guys on an age for this. It has a pinkish stained stem similar to sun purpling, a snapped rough pontil and wear to the base, no seeds and a nice ring, the glass in the bowl looks like what i can only describe as running dried paint in two places something i have not seen before.

I took the pics earlier in day light to try and show the tinge to the glass.

It's 6 1/2 inches in height, 2 3/8th inches across the rim and base, regards Chris.

[bat20]

I've seen some similar on line described as Georgian champagne flutes about 1825,might be a line to follow?

[Paul S.]

Looks more like a flute than a straightforward ale glass, and since probably C19 then could have been for either ale or champagne  -  apparently there wasn't a great deal of difference between the two.
In the U.K. saucers started to be used after the 1830's, so this might be an ale flute, but not easy to certain, and the everted rim might suggest more for the bubbly stuff.

[brucebanner]

I struggle to believe these delicate bits of glass are so old and have no damage, that is of course if it is from the 1820's.
 

[Paul S.]

my opinion would be for a later date - the snapped pontil scar can be found on quality glass at almost any time in the C19 ............but perhaps this one might be nearer to 1850 - 70.       I wonder if Ivo can find the pattern in his dansk catalogues.                  The knop structure doesn't look a million miles aways from Dirk's in this link:
http://www.glassmessages.com/index.php/topic,55942.msg317057.html#msg317057

could be wrong, but I don't think 1820 - but would be great if it was that old.  

[neil53]

Hi, I believe the pink stain is caused by an impurity in the glass.  I actually had one that was nearly purple not so long ago.  One of the glassmakers will correct me but I think it is an excess of manganese which causes the colour.  I'd agree with the 1830-1840 attribution.  They were well made and of reasonably thick glass so a lot have survived.  Much nicer to drink champagne from than a modern glass.

[Lustrousstone]

It is not necessarily an excess of manganese; it could just be too much time exposed to sunlight sitting on a shelf. The manganese, which is an additive used in smallish amounts to counteract the greenish effect of too much iron (the impurity) in the sand used, changes its oxidation state under UV light and reverts to the purple form. It's a slow process here in the UK but it does happen. Lots of manganese was one option for providing a rich purple.