Recent discussion about making color with B&W film made me think of trying Chroma Key with LF B&W film

Seems it has a long history https://www.36pix.com/blog-the-histo...chroma-keying/

Since i have a Blue backdrop, I could easily try LF masking in studio shots

Any thoughts, any suggestions on how to start?

What lens filter should I use with a blue background?

I want to do this all in DR with only B&W film and paper, perhaps background projection

No digital, no Photoshop manipulation allowed