• Are you proper squeezing the buffer off the swab too? At first I was only pressing it against the side of the vial, but it's much more effective to squeeze both sides of the vial and squish it on the way out.

  • You opening them before doing your swabbing? I had a bunch that were stingy on the liquid but waiting until the last second to open them after doing swabbing seemed to save enough from evaporating.

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