Black patina with shiny finish on silver

[themaker]

Hi, I’ve designed a few silver jewellery pieces, I need to add black patina and shiny finish to my pieces to complete the look but I don’t know how to go about it.

I’ve seen a few tutorials but mostly ended up watching the ones that gives the metal dark antique finish using liver of sulfur, eggs etc.

I’m after really smooth black colour and then finish the piece with a nice shiny look without rubbing off the patina if that makes sense.

What do people use professionally to get that smooth black finish, is there any black patina for silver? Any tips, advice or tutorial links will be greatly appreciated.

Thanks