Black coating/Plating for SS - APPROVED FOR USE AROUND FOOD

We need to find a coating/plating that will meet the following criteria:
1) Used on 410 SS
2) Will withstand 500 hr Salt Spray to red rust.
3) Aesthetically pleasing, shiny, smooth, etc.
4) Won't leave fill in recess (of screws)
5) IS APPROVED BY THE 'NSF' OR BY TITLE 21CFR 174 - 189.

Pamela F. Higgins
Distributor of screws, fasteners, etc. - St. Louis, Missouri, USA

Pamela,

Look at the photo attached.

This coating can be bright or matte black. It stands high-pressure sterilization. This is color anodizing process in eco-friendly solutions without chrome. Different colors can be obtained. If you want to conduct rust tests, give us a call, and I will send you a sample.