“The Hell-Fire was kindled for one thousand years and turned white. Then it was kindled for another thousand years and it turned red. Then it was kindled for another thousand years and it turned black. So it is black like the darkest night.”
Sunan Ibn Majah Book 37, Hadith 221
← Previous Hadith “The Fire complained to its Lord and said: ‘O Lord, parts of me have consumed other parts.’ So He gave it two occasions to exhale, one in winter and one in summer. The intense cold that you feel (in winter) is part of its severe frost (Zamharir) and the intense heat that you feel in summer is part of its hot wind (Samum).”

Sunan Ibn Majah Book 37, Hadith 220 Next Hadith → “On the Day of Resurrection the disbeliever who lived the most luxurious will be brought, and it will be said: ‘Dip him once in Hell.’ So he will be dipped in it, then it will be said to him: ‘O so- and-so, have you every enjoyed any pleasure?’ He will say: ‘No, I have never enjoyed any pleasure.’ Then the believer who suffered the most hardship and trouble will be brought and it will be said: ‘Dip him once in Paradise.’ So he will be dipped in it and it will be said to him: ‘O so-and-so, have you ever suffered any hardship or trouble?’ He will say: ‘I have never suffered any hardship or trouble.’”

Sunan Ibn Majah Book 37, Hadith 222