Etching and adding color to stainless steel

I’m trying to learn steel and I’m starting with etching my contigo
travel cup. So far the etch wiped in with ferric chloride is not as
nice as I had hoped. I want to color or patina now so etch will
stand out. I saw a video of using a butane torch slowly on a vapor
mod and can color steel to go and then purples. Can anyone advise me
with stainless steel?

Thank you