Line and Wash combines the crisp, defined lines of waterproof ink with the soft, flowing washes of watercolour. This contrast is what gives the images their exciting and vibrant quality. The use of waterproof ink is key, as it prevents the lines from bleeding when the washes are applied, allowing those crisp, robust lines to stand out. The "washes of colour" are typically applied after the ink lines have dried. This technique often lends itself to a loose, free-flowing approach which, in the absence of neat, straight lines, creates a sense of movement and vibrancy.