Decor Shift - The development of a decor by one manufacturer with the intention of having it resemble a decor by a competitor.
Design Shift - The intentional manufacture of a vessel using a shape or shaping technique which mimics a competitor.
Threaded - The application of glass threading, or fine strands to the surface of a vessel. Threading can be found in a random pattern, as in Loetz Chine, and also in a geometric pattern, such as in the Kralik Spiral decor. Threading is found in colors both similar and different from the ground color of the vessel it is applied to.
Veined - The application of glass threading, generally quite varyied in width, and in a random pattern on the surface of a vessel. Veining is generally found in a color that differs from the ground color of the vessel.
Corded - The application of a thick cord of glass, commonly refered to as a coil or a snake. Found as overlapping cords on some pieces. Veining is generally found in a color that differs from the ground color of the vessel.
Dual Attribution – An example showing distinct characteristics of two recognized glass houses. Most commonly seen as a "blank" being decorated by another house. Examples would be a Loetz blank decorated by Karl Goldberg (see Loetz Orphir), or a Kralik blank decorated by Hosch (see Kralik Opalescent).