Pitgran

Pitgran is a pale green, chalky substance that is mined for its alchemical properties. It’s used especially in recipes that have solid or semi-solid end products. Things like tanglefoot bags and alchemical alloys use pitgran as a key ingredient. It has excellent properties as a magical binding agent, which also makes it a desirable component in high-end inks used in things like spellbooks and magical scrolls.
It’s also highly-toxic. Pitgran miners or those working with it without proper protective measures slowly lose their senses and become blind, deaf, anosmic, and numb over time. Up to a certain point, the body can naturally heal from this damage, but there is a threshold of no return corresponding to roughly 25% sensory loss. Once that level of damage has occurred, the body is no longer able to heal from pitgran exposure. Removing the afflicted from an environment full of pitgran will stop further damage, but magical or ultra-tech treatment will be necessary.
Because pitgran is rare, useful, and toxic, it’s also expensive.

Properties

Material Characteristics

Pitgran is a pale greenish color and has a chalky, crumbly consistency. It turns into dust easily. It is slightly heavier than it looks like it should be, and has a distinct aromatic property which could best be described as "choking lack of smell." Pitgran dust seems to make air less airy and has a desaturating effect on colors viewed through it.

Compounds

Pitgran is probably the single most versatile alchemical component in the world; it acts as a kind of universal magical binding agent. Pitgran is seldom the best substance for the job, but it will almost always work if you can put up with two things. The first is its toxicity, though this is negated once it is mixed and enchanted in most cases. The second is its incredible chromatic inertia. Absolutely everything made with pitgran is green. It doesn't matter if it's steel, ink, or a vial of alchemist's fire. Green steel, greenish-black in, and a potion that explodes in green flames.
This is mostly a nuissence effect, but no one has ever discovered a work-around. This makes anything made with pitgran very easy to identify, which causes problems for those wishing to pass goods made with pitgran off as mundane for whatever reason.