how to make the rainbow potion


ok so you go to brady barr's lab, click on the little video game controller, and then you will be in potions. click on red 3 times, click on green 3 times, click on blue 3 times, click on the little fire 3 times, and finally click on the bottle now containing grey liquid, and then you're done. you get a rainbow potion, and the achievement called chemist.