All white and dirty insulators, when having a HCl bath turn to green. I use HCl to clean bolts, too. Here all the three suspensions I got in the dump. This is the classic type of old suspension: large cap, short pin. The mark of the suspensions is CERAMICA LIGVRE, (*)the first name of the VACCARI factory, the other insulators are marked VACCARI, being younger (all they date 1952).

(*) you can find both "LIGURE" and "LIGVRE"