把一条红色的丝巾放入手中,再从另一头取出,这时丝巾已变成绿色了,或把丝巾放入手中后,马上打开,丝巾已经不见了。
https://v.youku.com/v_show/id_XMTQyOTM0MjcwOA==.html?spm=a2h0k.11417342.soresults.dtitle
Dye Tube
This is a clever devise that allows for the changing one silk into another.
