Octopus Fluids writing inks are exclusive inks with pleasant shading, low feathering, optimal drying time, fast ink properties and a soft, supple spring. With our Rainbow Ink Mixing Kit, you can mix your own, very personal writing color. And this is how it works: The kit contains four writing inks in the primary colors cyan, magenta, yellow and black. The three primary colors cyan, magenta and yellow can be mixed together in different mixing ratios. Depending on the mixture, you will receive a different color. To darken your new color mix, you can now carefully use the color black. Caution: When mixing, the work area may become contaminated with ink. Pay attention to appropriate safety precautions against ink splashes! Ink contamination is difficult to remove. Keep wipes and water handy as a precaution! Use the enclosed syringes to mix.