I understand that Alchemist can copy spells as a Wizard could. This explicitly means that an Alchemist can copy formula out of a Wizard's spell book as long as the spell appears on the Alchemist's formula lists, and it strongly implies the an alchemist can copy formula from an arcane scroll as well. However, I can see that are some grey areas in regards to the process of copying formulas as well. With that being said, I have the following related questions:
Can an Alchemist copy formulae off of a divine spell? The RAW seems to be unclear on this. On the one hand, a Wizard obviously can't put divine spells into his spell book. However, it could be argued that the Alchemist can use any scroll to copy formulae into his formula book as long as it's on his formula list as the Wizard has the same ability in regards to his spell list.
Can an Alchemist copy formulae from another Alchemist's formula book? This might seem like a no-brainer, but this was never explicitly said to be something an Alchemist can do.
My question is if there are any further rulings on how an Alchemist can copy formulae into his formula book. If there aren't any such developer rulings, how would you rule on these matter?