This article describes an enrichment and extension of a published applied chemistry experiment involving the use of distilled fragrant compounds of natural plants to prepare facial toner. The original protocol failed to consider quality evaluation of the self-prepared facial toner. Herein, an additional experimental section is included for cosmetic inspection with respect to heavy-metal residues and microbial contamination. As a comprehensive chemical experiment for upper-division undergraduates, it is very popular and suitable for further popularization under the trend of decreasing class hours and increasing laboratory hours.