1,3-Butylene glycol.

1,3-Butylene glycol (1,3-butanediol) may be safely used in food in accordance with the following prescribed conditions: (a) The substance meets the following specifications: (1) 1,3-Butylene glycol content: Not less than 99 percent. (2) Specific gravity at 20/20 °C: 1.004 to 1.006. (3) Distillation range: 200°-215 °C. (b) It is used in the minimum amount required to perform its intended effect. (c) It is used as a solvent for natural and synthetic flavoring substances except where standards of identity issued under section 401 of the act preclude such use.