Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Mold problem!

The plates seem nice at first but then we noticed something awful about them. When pulling one off our shelf we noticed there was mold covering the whole bottom side of the plate! I grabbed another plate and found more mold. They all had the same problem!I've never seen anything like this before so I did a google search only to find that other people who bought this brand posted similar reviews on Amazon. There must be some organic material inside the plate that allows this stuff to grow. We washed the plates in the sink and then in the dishwasher on high temperature but the mold still comes back!Since we got these plates as a gift there isn't much we can do except throw them away.