The food additive dehydroacetic acid and/or its sodium salt may be safely used in accordance with the following prescribed conditions:
Dehydroacetic acid: Melting point, 109 °C-111 °C; assay, minimum 98 percent (dry basis).
Sodium salt of dehydroacetic acid: Assay, minimum 98 percent (dry basis).
21 C.F.R. §172.130