Topic: Chalcedony (?) handled vessel

[rocco]

I don't know if Chalcedony is the correct term to describe this piece, but it is the closest I could find.
Height 12 cm, diameter 16 cm, weighs 600 g  (so definately not lampwork), totally opaque.
Broken pontil mark.
Doesn't look like the pieces made in Hebron, but other than that I am clueless...
So any help highly appreciated

Thanks,
Michael

[Pinkspoons]

Could plausibly be a c.1930s calcedonio piece by Barovier, Seguso & Ferro - I've had a few pieces in the past with the same base finish and the same 'muddy' colour combinations.

[Ivo]

I have a set of streaky muddy glasses which.must be close. These have a sticker from a decorator firm. Never managed to find out who made them - though I suspect China. Not at home, unable to make and supply pix at least until January.

[Pinkspoons]

Frustratingly, I can't find any photos of the muddy-coloured calcedonio I've had - it was a long time ago - but I did find pictures of the base of a lovely Seguso brick red vase.

[rocco]

Thanks a lot for your thoughts, very much appreciated
Unfortunately I am not much wiser...

I couldn't find anything about Chalcedony glass from Barovier, Seguso & Ferro, more about older pieces.
I did have the vague hope that the vessel could be from Murano, though.
And I know nothing about Chinese glass in this style, so I am curious to see Ivo's glasses.

Michael

[Pinkspoons]

There's a single illustrated example within Heiremans' Seguso book.

Design & Arts had for sale a small cache of it from the Pauly & C. stock rooms some years ago - there were some absolutely wonderful pieces, as well as more workaday items.

[glass man]

Chalcedony is a name of a mineral combined with a stone. Rock collecting.  Bob

[glassobsessed]

Also the name given to this type of multicoloured glass that was originally developed to imitate chalcedony by Italian glassblowers (called calcedonio in Italian).

John

[flying free]

When I saw some old chaldecony pieces in Holland I was completely surprised at how transparent they are.  For some reason I had expected them to be opaque glass. 
m

[flying free]

This is a photo of one set of the three pieces in the collection I saw.
They were described as Agate glass but I believe they are Chalcedony.
It's very hard to get a picture or photo that shows how transparent they are because they are sort of dichroic, but I was completely taken by surprise when I saw them in real life at their transparency.  I'll try and add a larger picture.
edit

ok, pic 2 is a bulbous vase/vessel and was the best picture I could get to try and show the transparency, but still not good enough (they were badly dimly lit in small 'cases' or shelves in a large cabinet.
Pic 3 is the last vessel or cup and shows the design of the chalcedony effect in the glass, but also makes the piece look opaque and it very definitely was browner/more amber 'y'  than that in real life and transparent.  You can probably see the amber reflection in the photos of the bowl and cup.

 I guess the bone ash or whatever was used  to create the opalescent streaks is the dichroic bit (actually, I'm sure dredging my memory,that I read somewhere that arsenic caused that ??) causing the camera to reflect off them and make them look paler and opaque.

ok scrub that - I think it was lead arsenate I was thinking of which causes the opalescence in girasol glass I believe.
I couldn't find a reference to that in Chalcedony glass, so perhaps it was the silver used that causes the dichroic effect in chalcedony (can glow red under transmitted light)
These are all 18th century glass.

I think there is also an 18th century piece of Chalcedony glass in the Corning.  I'll try and find it for comparison.
So, whilst yours may be created to resemble stone, I don't really think it looks like these 18th century pieces is what I think I'm trying to say 

m