Ladies, please let me know.

I'm a guy, and I'm planning to buy cosmetics for my girlfriend in advance.
But for most of the things I was using, I bought them by remembering the brand and things like that.
The problem is the lipstick....
I just can't...
I don't know what color it is...
How should I distinguish this? Should I just take a picture of the product? (It's hard to take a picture secretly since I have it with me all the time.)

source: Concerns here