(1) The only animal casings that may be used as containers of product are those from cattle, sheep, swine, or goats.

(2) Casings for products shall be carefully inspected by department employees. Only those casings which have been carefully washed and thoroughly flushed with clean water immediately before stuffing and are suitable for containers, are clean, and are passed on such inspection shall be used, except that preflushed animal casings packed in salt or salt and glycerine solution or other approved medium may be used without additional flushing provided they are found to be clean and otherwise acceptable and are thoroughly rinsed before use.

(3) Hog and sheep casings intended for use as containers of product may be treated by soaking in or applying thereto sound, fresh pineapple juice or papain or bromelin or pancreatic extract to permit the enzymes contained in these substances to act on the casings to make them less resistant. The casings shall be handled in a clean and sanitary manner throughout and the treatment shall be followed by washing and flushing the casings with water sufficiently to effectively remove the substance used and terminate the enzymatic action.

(4) On account of the invariable presence of bone splinters, detached spinal cords shall not be used in the preparation of edible product other than for rendering where they constitute a suitable raw material.

(5) Testicles if handled as an edible product may be shipped from the official establishment as such, but they shall not be used as an ingredient of a meat food product.

(6) Tonsils shall be removed and shall not be used as ingredients of meat food products

(7) Blood from livestock prepared in accordance with section 310.20 of this Article may be used as an ingredient of a meat food product for which a standard is prescribed in Part 319 of this Article, if permitted by such standard, and may be used in any meat food product for which no such standard is prescribed in Part 319 of this Article if it is a common and usual ingredient of such product.

(8) Intestines shall not be used as ingredients in any meat food product for which a standard is prescribed in Part 319 of this Article and shall not be used in other products unless the products are labeled in accordance with section 317.8 (b)(30) of this Article.

(9) Poultry products and egg products (other than shell eggs) which are intended for use as ingredients of meat food products shall be considered acceptable for such use only when identified as having been inspected and passed for wholesomeness by the United States Department of Agriculture under the regulations in 7 CFR Part 59 or 70, or 9 CFR Part 381 or by the department and when found to be sound and otherwise acceptable when presented for use. Poultry products and egg products (other than shell eggs) which have not been so inspected and passed for wholesomeness shall not be used in the preparation of such meat food products.

(10) Dry milk products which are intended for use as ingredients of meat food products shall be considered acceptable for such use only when produced in a plant approved by the United States Department of Agriculture under the regulations in 7 CFR Part 58, and when found to be sound and otherwise acceptable when presented for use. Dry milk products prepared in a plant not so approved shall not be used in the preparation of such meat food products.

(11) All isolated soy protein used in products prepared in any official establishment shall contain not more and not less than 0.1 percent titanium incorporated as food grade titanium dioxide, and the presence of such substance must be shown on the label of the container of the isolated soy protein at all times that the article is in the official establishment.

(12) Ingredients for use in any product may not bear or contain any pesticide chemical or other residues in excess of levels permitted in section 318.16.