What can I put in a fire to make it change colors?
When I was a kid we used to make colourful fires by inserting garden hose into a copper pipe that had holes drilled through it.
Now that I realize how bad it was for the environment I really don't recommend you do that.
There are all these chemicals that change the colour of fire: Copper Chloride : blue Borax : light green Copper Sulfate: green Lithium Chloride: pink or red Potassium Nitrate: purple Epsom Salt: White Strontium Chloride: makes red flame in campfire. Potassium Chloride: makes a deep purple flame in campfire. Alum (thallium): a nice bright green flame in campfire. Used for pickling but can also buy cheap at drugstore Calcium Chloride : nice blue flame - is sold commercially as the product ” Damp-Rid” to get rid of moisture. Table Salt (sodium chloride)- make an orange flame. Boric Acid - deep red flame. Buy at any pharmacy.
A lot of those chemicals are VERY dangerous. If you can attain them, it would be smarter to NOT throw them in a fire since some are can be explosive when mixed with certain chemicals. If you want to see, go to http://hazard.com/msds/ to check on how dangerous some of these are. The potassium nitrate is a severe irritant that can cause pain if you touch it with your fingers just for one example...
if u have a fire and you want it to change colour u shud get potassium and copper sulphate etc and put them into the fire and they shud cahnge into sparkler colour or other flame colour do this safely and away from main housing area's