Liquid Paper, at one point, was one of the most toxic chemicals in most businesses as per the MSDS sheets (which almost all businesses didn't post) as it used trichloroethane (TCA).
I was the keeper of the file of MSDS sheets, made for some interesting reading (and I bet I was the only one that ever read them). We didn't use Liquid Paper, by then it was Wite-Out tape.