Section 15-22-4.7 - Extraction/Processing4.7.1 Cannabis processing licensees may utilize chemical extraction processes using a nonhydrocarbon-based, or other solvent such as water, vegetable glycerin, vegetable oils, animal fats, steam distillation, food-grade ethanol. Nonhydrocarbon-based solvents shall be food grade.4.7.2 Cannabis processing licensees may use chemical extraction processes using hydrocarbon-based solvents that are at least ninety-nine percent (99%) purity.4.7.3 Extraction processes shall take place in an environment with proper ventilation, controlling all sources of ignition where a flammable atmosphere is, or could be, present.4.7.4 Cannabis processing licensees are prohibited from using pressurized canned flammable fuel such as butane intended for use in outdoor/camp like activities, handheld torch devise, refillable cigarette letters, etc.4.7.5 Cannabis processing licensees using carbon dioxide shall have equipment and facilities approved by local fire code officials, if applicable.4.7.6 Manufacturing processes using flammable gas or flammable liquid shall have leak or gas detection measures, or both.