Explanation:
Blue stars are the hottest
Answer: This is the hue of mercury if you're looking for it. Mercury reacts with sulphur to generate a crimson hue. In the past, they always used a thermometer.
Explanation: However, due of its toxicity, individuals have switched to using alcohol in glass thermometers, which work similarly to mercury thermometers.
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They'd observe any new substances or new color, and temp. that is irreversible.
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A. Mg and S. Mg (Magnesium) and S (Sulfur) create MgS (Magnesium Sulfide).