Microwaves - finding the wavelength

[dragon2309]

Hi everyone, we were looking at different ways of finding out the wavelength of a microwave in physics a few days back, and one of them was to soak a piece of paper in a solution and put it into a microwave iven, when this solution got hot/warm it changed colour to blue.

Does anyone know what the solution was called, cos i need to write this all up and that's the only thing that's stopping me, if its any help it was a kind of purple/red-ish colour to start with...

Cheers, dave

 

[Farsight]

Just guessing, but does anthocyanin ring any bells?

 

[dragon2309]

it doesn't I am afraid, but does it ahve the same properties as i mentioned?? The one we used was called *SOMETHING* SOLUTION...

dave

 

[Farsight]

Um, I don't know dragon. How about Iodine? Permanganate? Copper Sulphate?

 

[dragon2309]

ah, copper sulphate, that was it, thankyou very much, now i can get on and write the rest of this thing up, cheers mate, much obliged

dragon

 

[Farsight]

Lucky guess, but it's a pleasure to help.

 

[DaveC426913]

Processed cheese slices work just as well.