Instruct: Classify Amazon reviews into positive or negative sentiment
Query: CONTAINS FORMALDEHYDE

I bought these for my kids for Christmas and was very disappointed after unwrapping the box to find a formaldehyde notice on the bottom of the box. This chemical offgasses and can be very harmful to health especially children. I am shocked and disturbed that M&D would allow this in their products. I have heard other instances of this brand using toxic paints etc and no longer think of them as the "natural" brand I used to.