quote..........."End of the day glass is a term invented by the Antiques Trade, rather than glassworks'."........... wouldn't doubt that for a minute Emmi, and like so many other things invented by that trade, it's best ignored. Raymond Slack makes no mention of the word, and Colin Lattimore describes it as a complete fallacy - as Sue says, there is no 'end' to the glass factory day. However, apparently slag glass did exist, and this is sometimes used as an interchangable description for end of day, although correctly this semi-opaque slag glass was only ever black or very dark green and seems not to have had a long production life (prior to the mid 1880's)
By the way, where do we look in the antiques trade for a provenance of your assertion as to the origin of this expresion??

- Do you collect this type of glass?
quote..............."I have never heard of cottage glass"..................join the club Dave, neither have I

I've just tried a variety of dictionaries and books, and unable to find a reference for the use of this word in the sense of a spatter/splatter multi-coloured glass with inclusions of mica and aventurine.
However - something else I didn't know..........there was apparently a glass works in Lambeth, London, active c. 1860, called 'The Cottage Glass Works' so maybe the potential for some confusion there.
I've looked in what I'd assumed would be the obvious place to find expressions like spatter/splatter and 'worked-in-splodges', but Ruth A. Forsythe makes no mention of them. The lady uses only enameled, mottled and varicoloured - but does say these Czech. pieces include mica and aventurine. The decorative effect we call spatter/splatter seems to have been a common feature on Czech. tourist glass in the 1920 - 40 period.
So, I wonder who gave us spatter, splatter and splodges??
attractive rose bowl by the way, and thanks to Sue for the i.d.
Refs. Victorian Table Glass and Ornaments - Barbara Morris.
English Pressed Glass 1830 - 1900 - Raymond Slack
English 19th-Century Press Moulded Glass - Colin R. Lattimore
Made in Czechoslovakia - Ruth A. Forsythe.