How do we make a transparent plastic sheet translucent?
To make a transparent sheet translucent, you just need to roughen up the surface (e.g. with sandpaper) so that light is scattered, rather than being transmitted uniformly. To make a translucent sheet transparent, you need to polish the surface smooth. Have you ever tried putting a drop of cooking oil on to a piece of tracing paper? The oil spreads and fills in some of the surface irregularities, creating a surface which goes some way to making the sheet transparent.
