Not silver but a tin alloy used to mate body components, but yes I can picture it looking like silver. I've done body work on my cars and used a simple propane torch to melt the alloy and flow it into cans to collect it. Old cars used lead but now there are lead substitutes used. The stuff melts at a relatively low temperature and flows like water. Horrifying pictures showing just the steel body of cars remaining after the fire, all other components burned away or melted off.
It’s also the aluminum used in parts of the vehicle.
When the current generation of the Ford Super Duty was testing, one caught fire.
All that was left was the frame, axles, and firewall sitting atop a silver looking blob (body work is all aluminum)
Looked like silver but yeah, aluminum. I saw a picture where a guy poured melted aluminum into an ant hill and when it cooled brought it up and you could see all the galleries and tunnels they built.