Subject: Does any chemical react with carotene in such a way as to be able to id it?

I am a 9th-grade student who, for her science class, needs to 
propose a science project (in other words, do everything short 
of actually performing the experiment oneself).

As part of my science project, does where an apple is grown 
affect the amount of carotene in that apple, I will need to test 
for the carotene in the apples. Therefore, is there a chemical 
that will react with carotene in such a way to indicate its 
presence? Thank you for your attention

Sincerely,
Ryan Holman

Re: Does any chemical react with carotene in such a way as to be able to id it?