Dating purple glass
Because presumably the people who turn it purple don't respect history or care that they are ruining an historical artifact & the people buying it don't know that they are purchasing a formerly valuable, but now worthless, antique.
Unfortunately your source for that information is not alone in believing that but is DEAD WRONG.
Some of this information is good and some of it, erroneous.
The objective here is to provide a useful chronology of the development and use of manganese as a decolorizer and to dispel some of the myths that have crept into the literature.
Manganese was required during World War I for use in munitions and no longer used in glass manufacture. The museum quality purple glass category is the only class that uses fresh plant material exclusively, and not necessarily native plants, to remind us and honor those homesteaders who struggled to grow a garden in the desert.
Due to its fragility, a collection can easily be lost due to fire or earthquake, therefore the Weed Show always has a class with broken purple glass as an accessory.
God bless you for helping to educate others & stamp out this awful practice.
Failure to comply may result in the suspension of your account.
And Arcoroc is making pressed glass in a color they call "Antique amethyst" -- so the color can NOT be trusted to tell the age of pressed glass.
If you truly just love this purple, why not buy glass made in the color rather than promoting the turning of American historical glass purple? It depends on what the meaning of "old" is and what the glass formula is.
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Although color is one of the more obvious and relatively easy to describe attributes of a historic bottle, it is unfortunately of limited utility in classifying a bottle as to age or type.