3 Oysters Hwangto from the I.Color.U collection is a medium tangerine orange fountain pen ink ink with medium shading and low orange sheen. It dries in 40 seconds in a medium nib on Rhodia and has a dry flow. The glass bottle has a cut out corner to lean the bottle for a decorative display. 3 Oyster ink is made in Korea.

Hwangto a special yellow colored soil from Korea. It is sometimes used in purifying and cleansing treatments. It is said to have special properties to filter out toxins and boost metabolism and circulation.