Questions with the keyword 'colour'

• how many different colours are there in this universe by anon-209856 to Verity, Sergio, Nick, Maria, David, Annette Comments: (No comments so far )
• When you say you point lasers at colourful liquids what does that mean and why do you do it ? by anon-209475 to Sergio Comments: (No comments so far )
• how are rainbows made? by anon-209855 to Verity, Sergio, Nick, Maria, David, Annette Comments: (No comments so far )