Art glass goblet with reactive properties

This is a tall, slender-stemmed art glass goblet exhibiting striking optical and fluorescent properties under ultraviolet light. According to user-supplied notes, which remain unverified by physical inspection, the piece stands approximately 7 inches tall with a diameter of 1.5 inches at its widest section. The bowl features a rich red coloration that glows in a vibrant orange-red hue when exposed to a 365nm ultraviolet light source, suggesting the presence of specific colorants such as cadmium or selenium within the glass matrix. In contrast, the exceptionally long, delicate, and clear stem shines with a distinct pale blue fluorescence under the same lighting conditions, indicating likely lead or other optical additives. The vessel displays smooth contours with a rounded bowl, tapering gracefully into the elongated stem that terminates in a flat circular foot. There are no visible maker's marks, signatures, or stamps discernible in the photograph; therefore, the identification rests entirely on visual characteristics, material appearance, and the reported ultraviolet reaction. The condition appears well-preserved with no obvious structural damage or repairs visible in the image, though surface wear can only be fully assessed in person. The style and fabrication techniques are broadly consistent with mid-century or later decorative art glass production, though an exact era, maker, or region of origin cannot be determined without further physical examination.

Based on what I can see in the provided image and information, I am evaluating this tall art glass goblet with reactive properties. Per user submission, the piece stands approximately 7 inches tall with a 1.5-inch diameter bowl, featuring red glass that glows orange-red under 365nm ultraviolet light and a clear stem with a pale blue fluorescence. I cannot verify from a photo the exact chemical composition, maker, or era, as the piece bears no visible maker's marks or signatures. My appraisal value estimate of $150–$300 assumes that the visual characteristics and optical reactions are consistent with mid-century or later studio art glass production. General market demand for decorative reactive art glass remains steady among specialized collectors, though values fluctuate based on attribution and flawless condition. The basis for this value estimate relies on the assumed aesthetic and technical quality of the vessel; however, surface wear can only be fully assessed in person. To move beyond a working hypothesis, what would be needed to confirm authenticity and maker includes in-person examination, hallmark verification, provenance documentation, and potential scientific testing by a glass expert. If the item turns out to be a modern reproduction, replica, copy, or produced simply 'in the style of' rather than by a recognized studio or maker, the value would likely drop to the $40–$80 range, reflecting purely decorative rather than collectible worth.