(Ar-Rahman) 55 : 37
فَإِذَا انْشَقَّتِ السَّمَاءُ فَكَانَتْ وَرْدَةً كَالدِّهَانِ
Then the sky will get ascender and will become melted just like ointment in red colour.
The sky seen as blue colour today will be melted on the Dooms Day and will become just like ointment in rose colour. See explanation 21: 104; 69: 16; and 70: 8.