Abstract: Nanoparticles of a compound are produced by spraying a solution of the compound into a heated chamber. The resulting product comprises a free flowing mixture of nanoparticles of the compound.

Abstract: A transactional control system, a promotional system, and a redemption system including a set of a card and a removable and reusable label. The removable and reusable label having a first side printed with indicia thereon, and a second side coated with a reusable adhesive layer suitable for affixing the label to either a first or a second planar side of the card. The label, printed with a registration indicia thereon, can be removed from the transaction card without leaving residue on the card and can be affixed to a registration form for registration of a holder of the transaction card. Alternatively, the label printed with a redeemable coupon indicia thereon, can be removed from a promotion card and affixed to a transaction receipt for associating a particular transaction with the redeemable coupon. In another embodiment the label is printed and scored to form individually removable segments which can be removed from the redemption card and redeemed.