| abstract |
PROBLEM TO BE SOLVED: To provide an external preparation for skin having an extremely high whitening effect. [PROBLEMS] To use as an active ingredient a balsam extract or a bisnaphthoquinone derivative of the formula I which is a component contained in the balsam extract. Contains whitening agent. An external preparation for skin further containing the whitening agent as an active ingredient. The external preparation for skin may further contain one or more selected from other whitening agents, active oxygen scavengers, UV inhibitors and anti-inflammatory agents. The above-mentioned balsam extract is aqueous methanol, aqueous ethanol, methanol, ethanol, butanol, acetone, One or more selected from ethyl acetate and chloroform are obtained as an extraction solvent. |