Science Buddies: "Ask an Expert"

when i read about the light and frequency experiment, it's interesting. when i try to do it, i'm give up...someone please guide me to do this experiment.... :

Bella, before we can help you, you're going to have to help us a little.

Is this the experiment you are trying to carry out: https://www.sciencebuddies.org/science- ... p051.shtml

If it is, what are you have problems with specifically? You need to give us more information so we can figure you how to help you.

hi again, i'm not really understand about the experiment,can i use a black cardboard to make the three sided box? and i really need a complete procedure or method...how to see the alcohol evaporate. thank you