Made my first bath bombs!!

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I can't answer any of the questions, but I too tried bath bombs for the first time a few weeks ago (haven't tried again yet, but plan to). They worked perfectly! No problems at all. I'll be curious if they are more difficult in the summer since the humidity will definitely be higher, but as for right now, I had no trouble. I used probably the most basic recipe possible. I think it was 1 part citric acid to 2 parts baking soda. Mix well, add color and scent and mix in well, then spritz with witch hazel until they hold together enough for molding. No warts, no other problems. They're hard as a rock now which kinda surprised me. I figured they would be a bit crumbly as I was making them. I think I will try adding some oils the next time and will probably have every problem known to man, but using this extremely basic recipe, no problems.

As for average fizzing time, I'd be curious about an answer here too. The only thing I can think to get a sense if no one else has an answer would be to buy a few bombs from various places and test each one. I've been thinking about doing this anyway to see what kinds of attributes I see in other people's bombs. Market research I guess!