Purpose• To determine the influence of water by using a spray testing machine for measuring the discoloration of upper materials (color migration, color fastness, color change).• To determine the color migration from lining materials to the sock and to the upper materials after the spray test.Apparatus• Spray Tester Machine Distilled water. (see figure 1)• White Socks made out of 100% cotton.(One socks can only be used one time)• Orthopaedic foot from Otto bock – Part #1A31 (see figure 2)