Is Realgar a poison?

[Ian Johnstone]

I am working on a intimidate build, and the item Imposing War Paint is attractive, but the downside is quite lethal.

I did some research into realgar, and this is the official description:

Archives of Nethys wrote:

PFS Legal Realgar

Source Alchemy Manual pg. 33 (Amazon)
Price 3 gp; Weight —
Realgar, also called ruby of arsenic, is a red crystal useful in creating poisons and medicines. It is commonly purified into arsenic, a crystalline metal known as the "king of poisons" for its popularity among nobles seeking to poison their rivals.
Power Component
Doses 1 (3 gp); Spells poison descriptor (see Pathfinder RPG Ultimate Magic)
Effect +2 DC to identify or neutralize the poison with spells or skills

It describes it as a poison, but it is not listed under the list of Poisons.

If I bought a Cracked Gamboge Nodule ioun stone, which allows immunity to a single poison, could I choose realgar and use Imposing War Paint all day?

[VRMH]

It's poisonous, but not a poison per the rules. So the RAW is against you, though your argument does make sense.

[Ian Johnstone]

The alternative is I take immunity to Arsenic, which is refined from Realgar, but that seems more of a stretch to be immune to the specific effects of realgar.