Cetrimide Agar, Non-USP (Pseudosel Agar) (Powder)

Store the sealed bottle containing the dehydrated medium at 4 °C. Once opened and recapped, place the container in a low humidity environment at the same storage temperature. Protect it from moisture and light. The dehydrated medium should be discarded if it is not free flowing or if the color has changed from the original light beige color.