Does anyone know how the Chinese factories blue their screws? do they use heat or do they anodize? If it's anodized, then a simple soak in greased lightning will fix the issue. Heat bluing would be next to impossible to remove completely.
If it's the same blueing process they used on the very first Angus PAM372, then it's removable by using micron paper to sand the coating off (this is from cwazy's post in my comparo of the Angus and H-Fac versions).