take a dry bottle (am injection bottle) having a rubber stopper. fix an empty refill through the rubber stopper. fill a drop of ink into the lower end of the refill tube, then close the bottle. dip this arrangement in luke warm water. what do you observe?
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20. To insert glass tubing or a thermometer into a rubber stopper: (a) If needed, fire polish the ends of the tubing
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if needed polish the ends of tubing;insert a thermometer to rubber stopper
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