6-1/2'' Coablt Bell "Snowman Frolic" design by Stacy Williams The fun spirit of winter is enhanced in this Bell with a Snowman Frolic on Cobalt design by Stacy Williams. Fenton has had more than 60 different Blues in their product line. Cobalt creates a dark blue and copper imparts a light blue. In combination with each other or with additional coloring agents, cobalt and copper are used for almost all of our blue colors