I've been making salts for Christmas presents for a number of years and until now, had never had a problem. I had lost the recipe I'd previously been using, and got a simple one off the web in December - epsom salts, baking soda, essential oils, food colouring. There had been no mention of any dangers attached to it. Yesterday I got a phone call from a friend who told me that her bottle exploded. At first I thought she was joking, but as she described her bedroom, I began to see that this was actually quite serious. She described her bedroom as being covered in little shards of glass and dust from one end to the other. She has vacuumed 3 times, changed the bedding, washed any clothes that were lying out, and is still finding more shards. The bag the bottle had been in was ripped apart, and had been blown across the room, along with a bag of chips that had been sitting next to it. She said there were over 65 pock marks in her wall from the glass. The pictures she sent me were out of focus, but showed that they weren't pock marks in her wall, but tears and rips right through the paint and into the drywall itself. The gift bag is missing one whole side, and the cardboard base was blown out. I'm so very glad that my friend was not in the room when this happened as I think she would have been seriously hurt. I usually use lavendar as an essential oil, but there is a possibility that I used a citrus this year, which I've also only just learned may activate the baking soda. I have also since found a recipe that doesn't use baking soda, and have decided that I will only use cork bottles in future rather than screw on caps. I've searched the web to see if others had come across the problem, but found very little. I did find a mention on this forum, and so decided to post this story here. I'm hoping to get some feedback on why my concoction exploded, why it took over 4 months to occur, hopefully get some advice on how to avoid this potential danger in future, and perhaps help prevent this from happening to others.