Stronger Acid is the first upgrade on the second path for the Alchemist in BTD6. It makes the acid thrown by the Alchemist (and any acid pools formed if that upgrade is purchased) deal increased damage. It costs $210 on Easy, $250 on Medium, $270 on Hard and $300 on Impoppable.


  • Stronger Acid buffs the acid attack by increasing damage rate from 2.0 seconds to 1.5 seconds, as well as increasing damage ticks to 3 from 2.
  • When this upgrade is combined with either Acid Pool or Larger Potions, it becomes a moderately powerful tower early game against grouped bloons.



  • Upgrading the Alchemist to this level, gives it gloves, suggesting that the acid is too dangerous to handle without them. The same applies to its subsequent upgrades.
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