http://theantiquarian.us/Hist.%20Richardson%20Brothesr%20.htminformation here on Richardson.
One quote taken from the article
'The elimination of glass excise duty led to an immediate surge in new designs and colors being offered to the market. At the Manchester Exhibition, W.H., B. & J. Richardson exhibited their products including opaline glass, layered and painted work. It was also reported that Richardson was experimenting with new and improved colors:
“Richardson are directing considerable attention to the improvement of colored glass, in this are we yet lag behind our neighbors: chemistry has at present done little for it in this country; these gentlemen have, however, already made great advances in rivaling the production of Bohemia: and we have little doubt a few years hence, we shall see at least equal to the best of the imported articles, their specimens of opal glass are remarkably successful: and of cutting, engraving, and polishing, thy supply examples second to none that have every been produced in this country.” '
Information here on Thomas Webb:
http://theantiquarian.us/Hist.%20Thomas%20Webb%20and%20Successor%20Co.htmAnd a quote from the article about Etruscan glass and opaline glass:
'In 1836, Thomas Webb also dissolved his partnership with his retired partner John Shepherd at White House, and in December of the same year, he resigned the Richardson & Webb Partnership at the Wordsley Flint Glassworks.
Webb continued to developed new products. In 1847, Webb was making opalescent glass decorated in an Etruscan style.'
Thinking about date for my vase, I wonder if in the late 1840's opaline glass was only being produced in white? In one of the Art Union journals of 1846 they were talking about seeing English ruby glass that matched any Bohemian glass. So perhaps if my vase is English it would be later. I need the CH book to look at the dates given for Rice, Harris and Son opaline as I do recall it said in there, they produced it in many colours.
Editing to add later:
I meant to say I came across something in the official catalogue of the Great Exhibition 1851. Under
Davis, Greathead and Green it said :
'Cut glass decanters, water jugs, goblets, ruby centres and stands, lustres with ruby and flint drops, cut and enamelled, coloured hock and other wine glasses,
a great variety of ornamental vases, white, opal, frosted, Mazareen (sic) blue, and topaz; painted, enamelled, cut and engraved. '
This was the only special mention of blue under the makers I could find. I've looked up Mazarine blue and I don't think my vase really fits that colour. However my vase is a very intense glowing kind of blue, that I've been unable to match really. It is also strangely decorated and could be described as painted rather than enamelled perhaps? Hence my questioning Davis, Greathead and Green with Keith under another thread yesterday

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