Non-fading - The range includes 18 lightfast and durable colours, all of which are mixable. The inks are not waterproof to achieve good flow properties Single pigment shades - the colours have been made from carefully selected pigments, where possible, only a single pigment has been used to achieve good mixability Techniques - The blue cap colours can be used with fountain pens, nibs, technical drawing pens, calligraphy nibs and even airbrushing Opaque - the 4 special colours (gold, silver, matte black, white) with red cap are opaque and only suitable for use with nib, calligraphy nib and brush Made in Europe - Winsor & Newton respects the needs of artists and produces the signs and calligraphy inks to high quality standards in its works in France