Hi, thanks for your replies!
The vase weighs just over 2.7kgs, though is not particularly thick walled. Most of the weight is held in the base. The thickest part of the vase(excluding the the base) would be the rim, where the white casing appears to have been folded outwards, leaving a small lip which has then been filled by the transparent layer.
It doesn't seem to smell of vinegar or feel at all greasy

There are many smaller bubbles under the surface, with a couple of larger ones, though I could only find one visible piece of grit.
It does have surface striations though these are quite subtle.
Also, though I'm not sure if this is particularly helpful, having looked at the vase again, the transparent pink layer of glass, which on the outside contains the drips of color, extends to the interior, in effect covering all of the vase.
Thanks again!