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Insulin syringes are cheap. Why not draw a portion of CA from the plastic bottle by penetrating it on the side and drawing what you need and then toss the syringe? Yes, a vacuum will be created inside bottle and it will draw air in when you remove the syringe. To compensate, place a tiny C-clamp around the bottle and tighten it a little more than it has collapsed to create positive pressure inside the bottle before removing the syringe. If you do this right, a little will squirt out and harden at the surface. Pick a different spot to penetrate the next time. Your CA will always be fresh this way.
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