Topic: Dating antique glass pot

[ju1i3]

I bought this piece (left in the pics) on ebay recently and something about it is not quite right to me but maybe I just don't know enough about antique glass. I compare it with the piece on the right which to me is correct for 19th century glass. 

The piece on the left is very light and thin. I think of antique glass as being heavy and thick. This was bothering me so much I weighed both pieces which are about the same size. The left piece is 35g whereas the one on the right is 45g confirming my impression that it is light. Does anyone measure glass thickness? or am I getting too obsessive?  :huh:

There's an indentation on the left piece on the left towards the top which I think shows how thin and light it was for that to have occured in manufacture. The pontil marks are a bit different but not sure it shows up in the pics.

The colour has a pink/purple tinge which I don't think I've noticed on similar pieces. I don't know if it indicates anything.

Can anyone help me with their thoughts, opinions, ideas? thanks very much

[Lustrousstone]

I think of antique glass as being heavy and thick.

Perhaps that's too much of a generalisation

I think perhaps you are being a bit too obsessive. Such comparisons are probably only vaguely relevant if you know they were made at the same place. They both look fine to my eye.

The purpling is called sun purpling and is caused by the manganese decolouriser used degrading in UV light. Here in the UK it's most noticeable as a greyness, as it takes a lot of UV to achieve purple of any shade.

[glassobsessed]

If an item is blown then the weight will be determined by how much molten glass the glass maker picks up in a gather, which will be different each time. Sizes may more consistent as the blower can use calipers or a template for comparison.

John