Instruct: Classify the given review into positive or negative sentiment.
Query: NEVER PUT FOOD COLORING IN - IT CAN BE POISONOUS

I read someone's great review - which was excellent - but was shocked at the part where he/she mentioned putting in food coloring - that can be TOTALLY POISONOUS to hummingbirds - NEVER ADD ANY CHEMICALS OR FOOD COLORINGS - either use sugar water or even the nectar you buy at the store. NEVER USE FOOD COLORING! Otherwise, great review and I can't wait to get mine in the mail!Update: I have received my hummingbird oasis and it's great - except so far I haven't seen any hummingbirds :-( It's a nice big feeder though, bright, was delivered quickly - very good product. COME ON HUMMINGBIRDS!!!!!