[ filter mask can be crafted with the following recipes

Player Recipe
Primary skill used: tailor(2)
Required skills: fabrication(1)
Time to complete: 15 minutes
Components required:
> 2x plastic bag OR 1x plastic bottle OR 2x small plastic bottle
> 2x rag OR 2x bandana OR 10x paper
> 10x charcoal
Byproducts:
(none)
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This recipe can be found in the following books when tailor is at least the required level:
A History of Firefighting (level 3)
Survival Under Atomic Attack (level 3)
Advanced Physical Chemistry (level 4)
chemistry textbook (level 4)
Guide to Advanced Emergency Care (level 3)
Art and Science of Chemical Warfare (level 3)