My ds has been fascinated by fire since he was 1. I swear he'd find a pack of matches or a lighter every time we went on a walk, too. And he could use them at the age of 3. To keep him from experimenting with it in closets (
), I told him he could play with fire anytime he wanted, that he just had to tell me. Using fire is an important skill. I've been amazed at the number of kids, his age and older who reach over the candles on a cake and almost burn themselves. I frequently am on the receiving end of snarky implications that I'm remiss in educating him, then I hear of people who refuse to let their children learn these important, possibly life saving, skills. He knows to clear away flammable material like leaves and twigs before starting a fire outside. He knows to have water handy. I still supervise, of course, even though he's been "playing" with fire for years. But on the off chance he is with other kids and one starts a fire, he won't be clueless.
You've gotten many good ideas. Another fun microscope idea is setting off the caps for cap guns (the paper roll style). Unroll it and aim the light at the little bump. You get a little bang but don't have to be quite as patient as you do to actually light a fire. It's good to realize a house fire can start by leaving eyeglasses or a drinking glass on a sunny windowsill the same way as with a microscope.
Ds went through a phase where he'd wonder how every sort of material would burn so he'd try it out and make observations. I discouraged him from burning in quantity things that would make fumes but he'd try little pieces. He likes experimenting with colored fire. He loves fireworks and sometimes dismantles them to see how they are made.
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Originally Posted by
ollyoxenfree 
If it isn't just the flames that she likes and she's ready to investigate the chemical and physical concepts behind fire, you can look up home experiments on oxidation and exothermic reactions. There are simple experiments using steel wool, vinegar and water.
Oooh, steel wool.
You can burn it with a 9V battery, too. Good to know, don't pack your batteries next to your steel wool! And don't put batteries in your pocket (where they can complete the circuit with loose change or keys) and burn you. Things I probably should have learned when I was a kid...