Topic: Early 19th Century plates, acid etched frosted base ?

[Cathy B]

But how do you know the frosting process took away the glass leaving the rim? Couldn't that glass have been removed by grinding, and then the texture/frosting applied afterwards?

[Cathy B]

Actually, does that frosting look overshot, perhaps?

[Andy]

But how do you know the frosting process took away the glass leaving the rim? Couldn't that glass have been removed by grinding, and then the texture/frosting applied afterwards?

That seems quite possible, not sure what you mean by "overshot" Cathy ?
I emailed Mark West, who has been a dealer/collector of Antique glass for many years, he used to have a
lovely shop, but now just a website  http://www.markwest-glass.com/
He hasnt got a copy of his own book  , but had a quick look at this link, he reckons, not machine ground,
but acid, very popular mid 19th C, which would mean a date circa 1857 or thereabouts.
I must put the accompanying glasses on the board, and see if opinion of date is similar.
Cheers
Andy
 

[Frank]

It has all the hallmarks of sandblasting and it was only done on the surface so the ridge was there before blasting.

[Andy]

Thanks Frank   confusion continues
The ridge has no real purpose , it was definitely just left after the frosting was done, the inner surface
of the bowl is smooth.
In fact , ive just had an even closer look, on the surface of the ridge, there are tool marks all the
way round, im thinking Cathys idea of it being machine ground first is most likely.
(does it matter, well not really, but its intruiging, isnt it    )
I think i may have captured the tool marks, here, every inch or so, round the ridge.