(a) The term damaged fur, as used in this part, means a fur, which, because of a known or patent defect resulting from natural causes or from processing, is of such a nature that its use in a fur product would decrease the normal life and durability of such product.

(b) When damaged furs are used in a fur product, full disclosure of such fact shall be made as a part of the required information in labeling, invoicing, or advertising such product; as for example: