https://en.wikipedia.org/wiki/Red_heat wrote:
According to Chapman's Workshop Technology,
the colours which can be observed in steel are:
From : 426°C To: 593°C => Black red
From : 594°C To: 704°C => Very dark red
https://en.wikipedia.org/wiki/Venus wrote:
Minimum Venus surface temperature: 438°C
Normal Venus surface temperature: 453°C
Maximum Venus surface temperature: 482°C