Variable reaction rate, but not hard to induce. You've seen bubbles when it contacts blood? It is somewhat unstable as it will degrade from heat and light. That is why it is kept in a brown container. Now if you are using it on live plants, it may cause some burning if you use to high a concentration. May cause some dark spots on leaves. I dilute 1:4 for spraying on plants. If you are using on harvested plants, not a problem.