Question about Auric Sight

[Fat_Turkey]

Hey all. I just read Robert Bruce's article on how to train Auric Sight, and I just so happen to NOT(oh my god) have anything purely blue or red around the house to cover up a book. Or at least I'm just too lazy to look. Anyway, I took a blue-ish (sorta light blue, sort of greenish) piece of small note paper, stuck it on to a white paper that was bigger and hung that on my wall. All the sticking was done with tape. Is this OK for training auric sight? Or do I absolutely need the covered book? I'm going to test it out in about an hour I just need to make sure I'm training right so I don't mess up or anything.

Thanks!
-FT