Calligraphy Ink Introductory Set by Winsor and Newton feature vibrant ink for handmade cards, invitations, and illustrations. Carefully chosen pigments ensure the ink maintains maximum brilliance of color and mixability. The high-quality formula produces lightfast colors with a good permanence rating (AA or A); however, they are not waterproof. The 30 ml bottles with blue caps offer thinner, non-clogging, transparent ink suitable for use in a dip pen, fountain pen, airbrush, or technical pen. The red-capped opaque inks are for use only with dip pens or brushes. The Calligraphy Ink Introductory Set contains 5 transparent colors (green, sepia, crimson, dark blue, and black) and 1 opaque color (gold).