"And when the heaven is split asunder and becomes rose-colored," meaning: reddish, "like ointment [kaldihan]," meaning: like the sediment of oil, according to the interpretation of Zayd ibn Aslam.
﴿فَإِذَا انْشَقَّتِ السَّمَاءُ فَكَانَتْ وَرْدَةً﴾ محمرة ﴿كالدهان﴾ يَعْنِي: كَعَكرِ الزَّيْت؛ فِي تَفْسِير زيد بن أسلم.