I am looking for a SAFE substance that is either:
Soluble in mineral oil but will extract into water.
Soluble in water but will extract into mineral oil.
Safe = Non-toxic, Non-Carcinogenic, Low Reactivity.
Ideally this substance should exhibit a color in one phase or the other.
This would be used as a student experiment for a Unit Operations Lab. The old extraction experiment used a known carcinogen and was discontinued.
Thanks in advance.