Be fascinated as the heat of your hand appears to boil methanol in these ingenious pens. The actual boiling point of methanol is 67°C so the liquid can't be boiling, but what's happening? As the heat from your finger warms the methanol it expands being forced up a small glass tube and giving the excellent illusion of a boiling liquid. These pens provide hours of fun and come at a great price too!
The liquid is contained in glass therefore it is unsuitable for children.
Finger Boiler Pen 
Be fascinated as the heat of your hand appears to boil methanol in these ingenious pens. The actual boiling point of methanol is 67°C so the liquid can't be boiling, but what's happening? As the heat from your finger warms the methanol it expands being forced up a small glass tube and giving the excellent illusion of a boiling liquid. These pens provide hours of fun and come at a great price too!