The beverage was said to have a rich texture that mimicked the froth of a cup of coffee or latte when poured, and Coca-Cola had high expectations for the drink.
One customer claimed the drink tasted like "flat Coke mixed with coffee" and that the sugar and artificial sweeteners gave the drink "an unpleasant artificial aftertaste."
Another customer pointed to the less-than-stellar branding of the product, and other people simply didn't like the bottle, as Coca-Cola Blak only came in small 8-ounce containers.