Gas chromatography–mass spectrometry (GC-MS):

Another analytical tool used to identify materials, especially useful for ancient or very degraded materials. See link – https://www.britishmuseum.org/about_us/departments/conservation_and_science/research/scientific_techniques/gc-ms.aspx

Gilding (Ceramics/ Glass):

Gold decoration applied onto the glaze by various techniques. Can be fired and unfired.

Glaze (Ceramics/ Glass):

Vitreous or glassy coating or surface on ceramics, impervious to liquids.

Grime:

A disfiguring deposit on or engrained in the surface of the material. Also referred to as surface dirt.