+1 to what WildCat said.
Where, Dabljuh, did you find that color-temperature scale? The ones I find put yellow/white at 2000F (about 1100C) and these are for steel.
Lets just use
one of many sources for this information on the internet:
http://www.sizes.com/materls/colors_of_heated_metals.htm
The variation demonstrates how unreliable this method is even in the hands of careful observers.
Even granted this - the observed bright white-yellowish glow in broad daylight displayed by the substance initially can not, and in no case whatsoever, be a product of the diffuse fire which burns orange hot at best.
*This* is the whole point. An orange fire cannot heat something to yellow hotness. A red fire cannot heat something to orange hotness. A yellow fire cannot heat something to white hotness.
If you understand this, you'll understand that you are in no way refuting this evidence, you are merely protesting it's existence. I don't have the time nor the patience to read the protests of people of lesser intelligence than me. Refute it or be ignored. Stop wasting my time with your silly protests. Here's the evidence. I can explain it the how and the why. All you're doing is demonstrating ignorance and a lack of intelligence.
What if it wasn't steel, as some others pointed out?
It wasn't steel. Steel would have been solid at the temperature range.
Different materials emit different colors at different temperatures.
No, they don't. That's the entire point of blackbody radiation. The brightness changes with the emissivity, but the color itself doesn't. Aluminium would be a pale, barely visible yellow glow at 1200 where iron/steel would display a distinctive yellow color. At 800 degrees, iron/steel would be cherry red, while the glow of aluminium would no longer visible other than in a dark room - and it would still be perceptible as a cherry red. The hue of the emitted light doesn't change significantly across materials, only the strength of the light emission. As I've explained before: For Aluminium to be as
bright as 1300°C hot iron, it would have to be 2200°C hot - And it would have a slightly different color still.