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Geez, rather than throwing out powder from your measure's resivoir, why not just label it?
Easiest way I've found to deal with this is I always have sharpies on the bench for making primers in a ladder load work-up. Tear off a strip of paper, write the powder on it, lay it on the top of the opening after you fill, and snap the cap on. Sealed, visible, doesn't turn into a sticky mess as with labels, etc. Another solution is wet-erase markers. They won't rub off simply from touching them, but come off easily with a damp rag.