mmmm, copper sulfate. My favorite. > Side Effects in Children While more research is needed, it’s possible that children may be more sensitive to copper sulfate exposure than adults. Children are most likely to be exposed if they crawl on the ground near copper sulfate or put into their mouths objects that have been exposed to copper sulfate. Keep this in mind when using copper sulfate, and make sure children are nowhere near the area just to be safe. Oops.