Comment on Im watching an episode of Mr. Rogers Neighborhood, filmed in black and white. In this scene a guest is showing glass making. What is going on with the film to make these black areas by the flame?

WoodScientist@sh.itjust.works ⁨1⁩ ⁨week⁩ ago

It’s called conservation of energy. The flame is hot and represents a local concentration of thermal energy. In order to concentrate this heat, thermal energy must be drawn from the outside air, greatly cooling it. This causes the air around the flame to appear black on film, as it is giving off much less light than the flame.

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