16 C.F.R. § 300.29
(a) For wool products which consist of, or are made from, miscellaneous cloth scraps comprising manufacturing by-products and containing various fibers of undetermined percentages, the following form of disclosure as to fiber content of such wool products, where truthfully appliable and with appropriate percentage figure inserted, may be used in the stamp, tag, label, or mark of identification of such product:
(1) Where the product contains chiefly cotton as well as woolen fibers in the minimum percentage designated for recycled wool:
Made of Miscellaneous Cloth Scraps Composed Chiefly of Cotton With Minimum of ____% Recycled Wool.
(2) Where the product contains chiefly rayon as well as woolen fibers in the minimum percentage designated for recycled wool:
Made of Miscellaneous Cloth Scraps Composed Chiefly of Rayon With Minimum of ____% Recycled Wool.
(3) Where the product is composed chiefly of a mixture of cotton and rayon as well as woolen fibers in the minimum percentage designated for recycled wool:
Made of Miscellaneous Cloth Scraps Composed Chiefly of Cotton and Rayon With Minimum of ____% Recycled Wool.
(4) Where the product contains chiefly woolen fibers with the balance of undetermined mixtures of cotton, rayon or other non-woolen fibers:
Made of Miscellaneous Cloth Scraps Containing Cotton, Rayon and Other Non-Woolen Fibers, With Minimum of ____% Recycled Wool.
[6 FR 3426, July 15, 1941, as amended at 45 FR 44262, July 1, 1980]