Color Changing shoelaceTM

For anyone wanting a quick, visual and simple truck wants to do this is absolutely the end. Whether you do children's shows, presentations or something else entirely. Everyone will be amazed. You show a yellow lace and announce that you will now have the hardest trick in the world. The coloring lace! The yellow lace pull by hand and this is indeed faded to green. You squeeze the hand still close, maybe too conspicuous. Everyone will ask to open the hand. Of course there is also a lace, but a red !!!! If you wish, you can also produce the yellow lace again somewhere else. Top-effect with sucker end. (From Trickmaster, not David Ginn version.)