It is quite likely a toxic mold that infected the print. It stunk like VS but it is a polyester print, so it is confusing, as they do not get VS.
Also, the print turned out to be in Russian.
Moral is, you should always wear a respirator when handling a print if it doesn’t smell right, I should not have assumed it was safe. Some molds are deadly and there is no ‘cure’, I was lucky in this case that it just made me very ill.

Let me know what you guys think of the scan, personally I wouldn’t want to continue with it even if it was safe, the print looks badly worn to me.