trollbeads Trollbeads Silver Beads Skull Trollbeads uses oxidation (blackening) on silver beads to add contrast and character to the designs. Silver sulfide forms when silver comes into contact with hydrogen sulfide and moisture in the air. By applying oxidation, the natural characteristics and expression of silver can be brought out. Trollbeads designers keep this technique in mind when creating their designs. It gives the beads a unique sense of weight and shine, expanding the possibilities of design.