Im pretty sure its called anodizing. I took a huge risk doing this but it really turned out wonderful. I only have one rda, it is an atomic. I found a youtube video where a guy torches his ss rda caps and turns them a cool blue color, ill post the link at the bottom as well as the pics i took of mine, i only torched the air control ring to a brass/gold color. The pictures don't do it justice but damn is it pretty. It is surprisingly easy but im sure it would be very easy to overdo it and mess up your cap. I just wanted to share this awesome technique.
http://youtu.be/TD1NS7xDfGY
http://youtu.be/TD1NS7xDfGY
Attachments
Last edited: