Your research has uncovered new formulations for your Bombs that you can apply just before throwing them. Choose three Bomb Formulas from the "Bomb Formula Options" section later in this class's description.
Replacing and Gaining Formulas
When you reach certain Alchemist levels, you learn additional formulas of your choice, as shown in the Formulas column of the Alchemist Features table. Additionally, whenever you finish a Long Rest, you can replace one of your Bomb Formulas with another formula of your choice. If another Alchemist feature gives you a Bomb Formula, it doesn't count against your number of formulas.
Applying Bomb Formulas
Once per turn when you attack with a Bomb or use the Bomb's Explode property, you can apply a Bomb Formula to it. Some Bomb Formulas change the Bomb's damage dice and damage type, including Improved Bombs damage starting at Alchemist level 5. Bomb Formulas don't change the size of the extra damage dice from ValdaSpire24.