The Speedflow ink is the same ink in the Molotow Burner Black markers. It's designed to dry quickly with a glossy finish. Speedflow is water-proof, UV-resistant and even scratch-proof. Recommended for indoor and outdoor use, it is cased in 250ml safety glass bottles and will give you about 10 refills in the Molotow Masterpiece. This is a warmer black compared to the Coversall.