Great for a variety of techniques including feathering, cross-hatching, calligraphy, detailed line work and outlining, this Sign Pen is ideal for use in the home office or studio for writing, sketching, and coloring and a favored by architects and designers. Personalize letters, create beautiful works of art and add a touch of creativity to journals or notes. Because the richly saturated colors are fully blendable with water and other Sign Pen Brush colors, you can combine colors for striking or subtle effects. Details:BlackFine fiber tipWater-based inkAcid freeFade proof and water resistantWill not dry out if left uncappedConforms to ASTM D4236