Quick poison and damage conversion question

Poison can only be applied by Physical and Chaos damage.

Does this work like Hatred where pre-conversion damage counts, or does it only apply based off the final damage type.

Example: Using Lightning Arrow with a Physical to Lightning support gem:

100% of your pre-conversion damage is physical.

0% of your post-conversion damage is physical

Abilities like Hatred have text that say it is based off your physical damage, but apply here because your pre-conversion damage was physical.

Does poison also work off your pre-conversion damage like Hatred, or does it only apply to the post-conversion damage (which would be 100% lightning and thus would not inflict poison damage)?


Edit: I'm basically trying to see if I should pick up the Fatal Toxins tree with a Lightning Arrow build or if it would just be 3 wasted points.

Poison works with the amount of physical and chaos damage you actually dealt to the enemy, so that's post-conversion.

Thanks for the quick reply.

On the bright side, 3 extra points makes build decisions a bit easier.