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I have not been able to find any answers to this. Does anybody know?

When I originally heat the brewing coffee from ground beans, the temperature is the boiling point of water as recommended but if I reheat to the boiling point of water again I have a feeling, the coffee will become dry and gray, but I have not tried it as of yet.

Arunabh Bhattacharya
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    If you are talking about initially heating coffee - can you please clarify whether you mean brewing coffee from ground beans or making instant coffee with granulated coffee and water? – Stephie Nov 21 '23 at 06:18

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The brewing temperature should be between 90 °C and 95 °C. If the temperature is too low, the aroma will be constrained, and if it is too high, the coffee will have a bitter and burnt flavor.

Sofi Juang
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After the initial brewing, you shouldn't reheat coffee at all. This will destroy much of the aroma and introduce a burnt taste.

It is much better to maintain the coffee at a nice temperature, eg. by keeping it in a thermos.

ths
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