It is my understanding that formalin hardened the skin of the person who
"discovered" it in pathology.  After many years of exposure, bare-handed
the effects on the skin were such....

I spent 16 yrs at AFIP and I remember in the 70's these bone folks who
used large dishes to fix and stain would stick their entire arm in NBF
and xylene.  And yes the one I speak of smoked over the containers and
did die of cancer.
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