Frit
From Fritipedia
Definition
Glass that has been ground to to various size "bits" that can be applied to beads to achieve different effects.
Frit is applied to a warm bead by pressing the bead into the frit. Common methods include using a teaspoon to hold the frit, or rolling the bead on a flat surface, such as a marver, that has been covered in frit.
Generally less is more when is comes to applying frit for two reasons