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Today I checked to see if any DMSO was on the rubber bulb part of the glass dropper, and there was. So, I no longer use the glass dropper/rubber bulb to cap the bottle of DMSO. Instead I use a standard cap and just use the glass dropper/rubber bulb to dispense DMSO drops.
I dispense DMSO with a glass dropper/rubber bulb and think that is okay if DMSO does not contact the rubber bulb.