Identification of type and likely sources of stone inclusions. "Stones" and other inclusions are small quantities of unwanted material that are embedded or buried in the glass itself. The most recognizable form is called a "stone," and generally consists of solid material encased in the glass while it was still molten. However, inclusions also consist of materials embedded in the glass surface during forming, or gas bubbles in the glass (also called seeds or blisters). All of these defects can negatively affect the performance of a glass article, and our expertise allows for the evaluation of these defects for severity, composition, and root causes.

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