Label them with the full product name and date received, and keep them closed in a suitable cool place away from direct light.

If a sample changes appearance or leaks, stop using it and contact the seller. Keep notes on which samples you wish to revisit.

A fragrance collection should feel connected to your own experiences, needs and preferences. Let the finished product's details, directions and real wearing experience guide your decisions, rather than an advertising trend or a presumed standard of luxury.