Wine Glass Art

In the 18th Century, glass makers would draw spiral patterns in the stem as they made the glass. If they used air bubbles it was called an airtwist; if they used threads, either white or colored, it would be called opaque twist.
ISO Wine tasting glass
The ISO has standardized a series of glasses for wine tasting. They are stemmed with elongated tapered bowls, with capacities of 120 (for sherry), 210, 300, or 410 millilitres.ISO 3591:1977