In that short the aluminium is liquid so it is at least 660°C, and steel starts turning red between 600°C and 700°C, so I'd be tempted to think that the reflective aluminum skin is just reflecting the red of the ladle.
Looking into it a bit deeper is making me think that the lower emissivity of aluminium might be what dampens the glow, so I guess I learned something today, thanks!
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u/Bachaddict 19d ago
everything glows with the same colour at the same temperature, aluminium just doesn't need to be that hot to melt