Copper is a key ingredient of most antifouling coatings, valued for its ability to provide the best overall balance of environmental protection and cost savings.
Chemical coatings can also be combined onto a single coating, allowing for a crackle tube to have multiple simultaneous filaments of several different colors.
For example, porous tantalum coatings are used in the construction of orthopedic implants due to tantalum's ability to form a direct bond to hard tissue.
