How many colors make black? Gather as many water soluble black markers as you can find. You will be amazed as black magically turns into vibrant purples, blues, greens, magenta, and more with just a drop of water! Draw a small circle in the middle of a coffee filter with a black marker, then use an eye dropper to drip water on the mark. A radial pattern of color spreads before you! This activity introduces the concept of chromatography. Chromatography comes from the Greek word chroma meaning "color" and graphia meaning "writing". Chromatography is a fun way to explore the separation of color pigments.