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Much annoyance is caused when one attempts to use a glass hypodermic syringe and finds that one failed to wash out the syringe after the last using, that the medicament has recrystallized around the plunger, and that no amount of force short of breaking will loosen it.
To overcome this, remove the metal finger rests and carefully drop the syringe into a test-tube two-thirds full of a 20 per cent. solution of glycerin and water. Boil for a minute or two over a spirit lamp; then remove, and holding in a towel while still hot, give a twist and the trick is done.