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Heat from your finger causes the colored liquid in the lower viewing chamber to "boil" and rise, filling the bubble on top. A fascinating demonstration of the laws of heat expansion. Shake it down and do it again! It's science at your fingertips. Available in blue, green, purple, or red. Note: Top of pen is breakable glass filled with non-toxic methanol and food coloring. Ages 12 and up (Not a toy!).

#5167 is being discontinued, limited stock available.

Qty	Item#	Description	U/M	Price
	5166BL	pen, Fingerboiler, blue w/blue ink	ea	$2.98
	5166GR	pen, Fingerboiler, green w/blue ink	ea	$2.98
	5166PU	pen, Fingerboiler, purple w/blue ink	ea	$2.98
	5166RD	pen, Fingerboiler, red w/blue ink	ea	$2.98
	5167	pen, Fingerboiler, refills, blue ink	ea	$3.38