Questions with the keyword 'colour'

• What is the difference between a sodium vapour lamp, Which gives out a yellowish colour illumination, and a mercury by alysha and 1 other. to Hitesh, Hywel, Mae, Nik, Tiffany Comments: (No comments so far )
• Soaps come in different colours. But why is soap’s lather always white in colour? by alysha to Hitesh, Hywel, Mae, Nik, Tiffany Comments: (No comments so far )