Gina K. Designs -. Designs Ink Cubes are acid-free and PH-Neutral. They are convenient for travel and easy to store. They are an economic way to collect lots of colors and they coordinate with our exclusive card stock. This set includes: Coral Reef, Key Lime, Lucky Clover, Plum Punch, Sea Glass, Slate, Tangerine Twist and Tranquil Teal.