Absinthe glasses come in many forms, but all have a demarcated reservoir to indicate the correct dose of absinthe - in some cases this is a "bubble" in the glass, in others it is an etched line to show the fill level.
Based on Belle Epoque originals used in the bars and cafes of France, they are generally robust and fairly large, to accommodate both the absinthe dose and a generous quantity of iced water as well. They are an absolutely essential accoutrement for any absinthe lover.
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