Is this coil rust?

[Lanore]

I have found that you can extend the life of a coil and remove part of this browning by soaking it in vinegar for 5-10 minutes. My usual routine is:

Dryburn
Rinse
Dryburn
Soak in Vinegar for 5-10min
Rinse
Dryburn
Wick

I've managed to keep a coil shiny for around 3-4 weeks like this, but eventually they dull. Further, some coils are just bound and determined to get dingy looking after a few days no matter what I do. Perhaps it depends on the juice being vaped as well.

I should note that having done this on protank and smoktech ARO heads for over a year, and an rda for a good bit now, I'm fairly confident in my results, but I am far from experienced with a large range of equipment, and so I could be very wrong.

 

[4nic8]

I consider mine like seasoning a grill, after 1 week and daily dry burns the resistence has gone up a tiny bit but the coil is heating evenly, I get less snap crackle and pops (I pretty much exclusively vape twisted coils) and I go about 6-8 weeks before I change them out, sometimes longer depends on the juice I've been using.