And in addition to its practical uses, it would seem to work for cosmetic purposes. This powder would make my very skin glimmer for eternity." Henry frowned. "Not eternity," he said, but then he brightened. "But I could make you up another batch whenever you please!" "I could shine at will!" Magnus grinned at Henry.
Cassandra Clare (2014). “Clockwork Princess”, p.281, Simon and Schuster