Fire and ice: here the propane tank and hose show up as the blackest objects
in the scene because of the Joule Thomson effect (expanding propane gas
cools, causing ice to form on the tank and hose):
Now I grab the mop:
the bucket of hot asphalt (approx. 500 degrees) shows up as white:
The wearer can see (and so can a remote expert who can also comment on)
areas where the coverage is poor:
After good coverage with asphalt, the base sheet is rolled down:
After the base sheet is rolled down, the eyeglasses provide a sort of
"x-ray vision" in which the wearer can see through the various layers of
the roof to make certain that the materials were applied properly:
