Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Horrid

I teach math at the university level and love to use colors when lecturing. It makes notes and diagrams pop, and makes it easier for the students to learn. However, I go monochrome when my only option is Crayola chalk. The colors look washed out and are hard to distinguish. Good chalk writes smoothly. Crayola doesn't. The final nail in the coffin is the fact that it doesn't erase well. I have to scrub the blackboard to get this junk to erase.