Vertical & Horizontal Trial Studies Video
Check it out. This is the video the NPA has on our YouTube channel. You should subscribe. We're adding more and more of this type of content there every week.
Ramblings on about natural perfumery . . . and other moderately related perfumery stuff, written by Justine Crane, natural botanical perfumer, olfactogustatorian, writer, alchemist, and owner of The Scented Djinn Parfum Apothecary & Thurifercorum