My latest attempt at a mod included a number of custom materials, and a number of other mod I use do so as well. With my latest fortress I found out that they need some adjusting due to them showing up some awfully weird places.
Weirdest weirdness: This lovely artifact

Frozen slime? Elves? What the hell. I didnt get a better look at the artifact as it evaporated right away.
Its main ingredient was some mountain goat bones, and its decorative items were some gems and cloth. Nothing that should produce this...
This material was in fact part of a mod (The moody dwarf got nauseus and vomited all over, which was what that material does. He was still estatic.) But Im not sure whether its the modded part that made it show up. I think it may have showed up because this material is the very first in the inorganic material list (the raw file is at the alphabetical top of the list, and the material entry is the first in its file)
Is this a problem with my modding or is it some weird bug?
Next was a number of traders showing up with a material I use to kill dwarves. The traders exploded and burned to death in seconds, some animals and slaves MELTED out of their cages and casualy walked to my meeting zone. Dont use the extract template for those things. The same probably goes for milk, blood, etc templates.
These materials also turned up in the stockpile menus.