Ever since my sister got her tank ( And put me to work getting it through a fish in cycle) we have had a lot of time to get acquainted with the liquid test kit. She happened to be there when I was testing the water for ammonia, and she noticed the hazard sign on the bottle: corrosive. After explaining what corrosive means to her, she is absolutely terrified to go near me when I'm testing the water. I told her to just be careful and she'll be fine, but she is absolutely terrified. Has anyone ever experienced something awful with the test kits before? She doesn't want me anywhere near it now. What can I do to set her mind at ease?