They said, "Call upon your Lord for us to make plain to us its colour." He said, "He says, `It is a yellow cow, bright in its colour, pleasing the beholders."'In his Tafsir Al-Awfi reported from Ibn Abbas that, فَاقِـعٌ لَّوْنُهَا (bright in its colour),"A deep yellowish white."As-Suddi said, تَسُرُّ النَّاظِرِينَ (pleasing the beholder),meaning, that it pleases those who see it.This is also the opinion of Abu Al-Aliyah, Qatadah and Ar-Rabi bin Anas.Furthermore, Wahb bin Munabbih said,"If you look at the cow's skin, you will think that the sun's rays radiate through its skin."The modern version of the Tawrah mentions that the cow in the Ayah was red, but this is an error. Or, it might be that the cow was so yellow that it appeared blackish or reddish in color. Allah's knows best