back in the 1980s when i was teaching myself dry plate work
i used to buy quarts of flexible collodion from the pharmacy.
yeah i know it is the wrong kind of collodion ( it has camphor and stuff in it )
but just the same ... it is collodion and out of the bottle it does the same sort
of thing that collodion spiked with iodide and bromine ( hope i got those chemicals right )
anyhow, i coated plates with it and had a bunch of fun ...
from my own experience, i wouldn't want to pour collodion on my skin.
it burns ...
even though it was used regularly to coat wounds in the us civil war,
and is a component part of nu skin, and even nail polishes i wouldn't do it ...

if you want an image on your skin, do what avedon did when he was a kid ... tape a negative
to your skin, and go out in the sun ...
way less dangerous than coating your skin with explosives laced in chemicals that you later
have to soak in cyanide ...

good luck!
john