The bath bomb clue was so much fun! We had made bath bombs at a previous activity so I knew how to make them. The ones we had made for actual baths had coloring and coconut oil and lavender oil in them, but the big one I made for the escape room was just plain baking soda, citric acid, and a tiny bit of water. I didn't want to risk coloring because there is always the possibility that it will spill! I sort of "laminated" the letter and scripture clue that I put inside the bath bomb with clear packing tape. That is my lazy mom lamination trick! If you have a laminator or you want to pay for lamination at a copy store, go for it! When the girls put it in the water the reaction was great! It fizzed like crazy! When the bath bomb dissolved, the clues were revealed!