Sailor inks are known for their saturation and interesting colour-changing properties, and the Ink Studio is no different. Ink Studio is a collection of 100 unique colours, each colour in the collection is expertly crafted by Sailor's inkmeisters, and each blend is expertly made by mixing dye particles, giving the inks unique characteristics (such as sheen and shading). Like a lot of fountain pen ink, this means that the ink is not waterproof, but it makes it safe for all fountain pens. The inks come in 20 ml bottles.