Does white paper appear different when you look at it through thin blue plastic or glass? Or, thin yellow plastic or glass?
Yes, white paper appears different when viewed through coloured transparent materials. Through thin blue plastic or glass, white paper appears blue or bluish-white. Through thin yellow plastic or glass, white paper appears yellow or yellowish-white. The coloured transparent material changes the appearance of the white paper by filtering the light that passes through it.
Explanation
This question from Activity 4 on Page 7 helps students observe how coloured transparent materials affect our perception of colours. White paper reflects all colours of light, but when viewed through a coloured transparent material, only certain colours pass through, making the paper appear to take on that colour.