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When you cup your fingers around the lower bulb of the hand boiler, the heat of your hand causes the air in the handboiler to expand. As a result, the air forces the liquid up the tube and then bubbles through the liquid.
Each design of the hand boilers is different and "boils" easily. We will do our best to send you your selected color of the handboilers. Availability varies.
NOTE: If broken, contents may stain fabric or surfaces.
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