Abstract: A method for preparing an aliquot of solution comprising a plurality of particles is disclosed. The method includes agitating the solution with a baffle at a predetermined mixing speed to suspend the plurality of particles in the solution, wherein the baffle positioned at least partially within a vessel containing the solution, and wherein the vessel is engaged with a vessel receptacle configured to hold the vessel. The method also includes withdrawing, during the agitating, the aliquot of solution from the vessel with a pipette, such that an end of a pipette tip is positioned within the vessel.

Abstract: A generally rectangular container for the storage and protection of sports cards having a rigid Internal Enclosure (6) which is slidably insertable and completely removable from a rigid External Enclosure (8).The External Enclosure (8) incorporates two Fingergrip cutouts (8a) and (8a') located to the front and to either side of the External Enclosure (8) to permit grasping the Internal Enclosure (6) for removal. The Internal Enclosure (6) has the capacity to store a plurality of cards and permit random access of such cards by utilizing spaced Bottom Rails (6a) and (6a') which create a gap sufficient for the insertion of a finger or fingers to raise any specific card, or series of cards, up and out of the card stack. The front panel insert (10) to the Internal Enclosure (6) is transparent, thus permitting visibility of the first card in any sequential ordering of cards.