Black Line is black with gold glitter. I think the black and gold mixture create a greenish tinge to the colour. This is a very wearable colour for day or night. I will wear this thinly on my upper lash line during the day, but wear it thicker and line my liner lash line for the evening. Black Line liner reminds me of MAC Mineralize Eyeshadow in Gilt by Association, which is a black eyeshadow with gold bronze pearl and Urban Decay 24/7 Glide on Liner in Stash.
Check out the review of MAC Art Supplies Collection Pearlglide Intense Eyeliners