they are all the same.
This is an expensive and dangerous thing to do. The chemicals, which are not good for you to touch or breath, are expensive, and the equipment to heat them and use them is expensive. You could take the knife to a metal-working shop or a gun shop and ask them about it. The 'black oxide' process might be cheapest . . .
Probable broken door inside the dash. Have a mechanic check the ac system for trouble codes.
Heat
the heat capacity of iron is 450 J/(kg * K), Heat Conductivity Rates 80 k,
Check the driver side of the intake for a loose vacuum line.
Look for the invader.
Thermal goggles are sometimes known as heat vision goggles or night vision goggles. They are used by the military and emergency personnel to see things in the dark or through walls.
Well you get the heat vision goggles from the poor man next to the factory but first get a nickel from a robot (give the poor man the nickel)
you go in the club put them on and look at the heat vent
we wear it to look for the inventor
you give the nickel to the homeless man
use heat vision goggles and it is blue green yellow and red
pop out and jump on him!
He is in the vent by the drink station in the club
infrared
infrared
Night vision goggles using thermal imaging technology capture the infrared light being emitted as heat by objects in the field of view.