I started a thread in the suspension section on restoring some rear leaf springs and wandered off thread talking about Insta-blak finish and windshield fluid nozzels. As mentioned I spoke with Bob P about the nozzle finish and he mentioned that they should be a dark brown. Below is a pic of some nozzles which i cleaned in evaporust and it is clea that they were zinc dichromate with a dark finish applied over the top. i have heard it was black oxide in other threads. That is why i purchased the Insta-blak poduct as i heard it gives you that black oxide finish in a DIY treatment. Question is shoulkd it be black or dark brown. I'm only seeing blackish grey. The one on the far right with the hose attached hasnt been cleaned sitting on the shelf for 3 decades.