Translucent.
Ordinary cardboard is a type of paper, and is almost always opaque (visible light does not pass through it). It is possible to make it thin enough to make it translucent, especially in bright sunlight. If it were transparent (see-through) then it would not be called "cardboard" any more.
Translucent.
it is semi-translucent
Opaque means not allowing vision or light through. Translucent means allowing light, but not vision.
Aluminum foil is opaque.
Usually, it is opaque (you can barely see through it). However, it can sometimes be so thin that enough light gets through it and you can see some things behind it.
translucent
Translucent.
Opaque
Opaque
Opaque
No, it's translucent.
Its transparent to red light, translucent to other colors.
Translucent.
Sponge is translucent or opaque
Ordinary cardboard is a type of paper, and is almost always opaque (visible light does not pass through it). It is possible to make it thin enough to make it translucent, especially in bright sunlight. If it were transparent (see-through) then it would not be called "cardboard" any more.