Optimist Sketching Set of 6 Optimist Mixable Color is an intensely-pigmented, quick-drying, waterproof ink—perfect for sketching and mixed media art. This box contains six of our most intense colors, ready to use right from the bottle. Feel free to drip Optimist straight from the Precision Bottle onto the page—or get a bit more specific by applying Optimist colors with your favorite brushes and dip pens. The Optimist Sketching Set includes six bold colors that aren't found in our standard CMYK+ Mixing Set. Slide open the box to find six 50 mL Precision Bottles filled with Prussian Blue, Red Violet, Mediterranean, Basil, Federal Red, and Tangerine.