Making stuff with Alchemy

This is a bit of a system note about making non-magical things with Alchemy.

The relevent skill is Philosophy, and it requires both a laboratory and reagents to proceed.

Coloured Salts: difficulty 11, produce coloured flames when burnt
Gunpowder (small amounts): difficulty 13 - enough for a flash-bang in a fire, not enough to do damage.
Poison (simple): difficulty 9 - a simple poison that has to be consumed, but doesn't have a disguised taste or appearance, a strength equal to the roll. -3 for disguised appearance, -3 for disguised taste, -5 to be weapon deliverable
Acid: difficulty 15 - strong enough to dissolve or weaken metal, needs to be kept in glass, strength 9 attack