use a small sheet of metal
and cut out the head shape.. the change in heat conductationism* should make a colour change occur
suppose it would depend on the thickness
.. then again, maybe something like olive oil spread into the correct shape would do the same job
*George W. Bush Science School
( ,
Wed 22 Jun 2005, 14:51,
archived)
suppose it would depend on the thickness
.. then again, maybe something like olive oil spread into the correct shape would do the same job
*George W. Bush Science School